diff --git a/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelper.java b/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelper.java
new file mode 100644
index 00000000..d7667c2c
--- /dev/null
+++ b/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelper.java
@@ -0,0 +1,141 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.utils.collections;
+
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+
+/*******************************************************************************
+ ** Help you use a multi-level map, such as:
+ ** Map[String, Map[String, Integer]] countryStateCountMap = new HashMap[]();
+ **
+ ** Where you always want to put new maps at the lower-level if they aren't there,
+ ** and similarly, you want to start with a 0 for the value under each (final) key.
+ ** So instead of like:
+ **
+ ** countryStateCountMap.computeIfAbsent("US", () -> new HashMap());
+ ** Map stateCountMap = countryStateCountMap.get("US");
+ ** stateCountMap.putIfAbsent("MO", 0);
+ ** stateCountMap.put(stateCountMap.get("MO") + count);
+ **
+ ** You can just do:
+ ** MultiLevelMapHelper.getOrPutNextLevel(countryStateCountMap, "US",
+ **    stateMap -> MultiLevelMapHelper.getOrPutAndIncrement(stateMap, "MO", count));
+ **
+ ** Or for a bigger map, such as:
+ ** Map[Integer, Map[String, Map[Integer, Map[String, Integer]]]] bigOleMap = new HashMap[]();
+ *
+ ** getOrPutNextLevel(bigOleMap, clientId,
+ **    map -> getOrPutNextLevel(map, sku,
+ **       map2 -> getOrPutNextLevel(map2, warehouseId,
+ **          map3 -> getOrPutAndIncrement(map3, state))));
+ **
+ *******************************************************************************/
+public class MultiLevelMapHelper
+{
+
+   /*******************************************************************************
+    ** For the given map,
+    ** If the key is not found, run the supplier and put its result under that key
+    ** Then get the value under that key and pass it to the Consumer next
+    *******************************************************************************/
+   public static <K, V> void getOrPutNextLevel(Map<K, V> map, K key, Supplier<V> notFoundSupplier, Consumer<V> next)
+   {
+      map.computeIfAbsent(key, k -> notFoundSupplier.get());
+      V v = map.get(key);
+      next.accept(v);
+   }
+
+
+
+   /*******************************************************************************
+    ** For the given map,
+    ** If the key is not found, make a new map[1] and put its result under that key
+    ** Then get the value under that key (the next level map) and pass it to the Consumer next.
+    **
+    ** [1] - the new map will be the same type as the input map, if possible - else
+    ** will be a new HashMap.  To control the map type, see the overload that takes
+    ** a Supplier notFoundSupplier.
+    *******************************************************************************/
+   public static <K, K2, V> void getOrPutNextLevel(Map<K, Map<K2, V>> map, K key, Consumer<Map<K2, V>> next)
+   {
+      map.computeIfAbsent(key, k ->
+      {
+         try
+         {
+            return (map.getClass().getConstructor().newInstance());
+         }
+         catch(Exception e)
+         {
+            return (new HashMap<>());
+         }
+      });
+      Map<K2, V> v = map.get(key);
+      next.accept(v);
+   }
+
+
+
+   /*******************************************************************************
+    ** For the given map,
+    ** If the key is not found, run the supplier and put its result under that key
+    ** Then apply the Function next to that value, replacing the value under the key.
+    *******************************************************************************/
+   public static <K, V> void getOrPutFinalLevel(Map<K, V> map, K key, Supplier<V> notFoundSupplier, Function<V, V> next)
+   {
+      map.computeIfAbsent(key, k -> notFoundSupplier.get());
+      V v = map.get(key);
+      map.put(key, next.apply(v));
+   }
+
+
+
+   /*******************************************************************************
+    ** For the given map,
+    ** If the key is not found, put a 1 under it.
+    ** else increment the value under the key.
+    *******************************************************************************/
+   public static <K> void getOrPutAndIncrement(Map<K, Integer> map, K key)
+   {
+      getOrPutAndIncrement(map, key, 1);
+   }
+
+
+
+   /*******************************************************************************
+    ** For the given map,
+    ** If the key is not found, put the Integer amount under it.
+    ** else increment the value under the key by the Integer amount.
+    *******************************************************************************/
+   public static <K> void getOrPutAndIncrement(Map<K, Integer> map, K key, Integer amount)
+   {
+      map.putIfAbsent(key, 0);
+      Integer v = map.get(key);
+      map.put(key, v + amount);
+   }
+
+}
diff --git a/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelperTest.java b/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelperTest.java
new file mode 100644
index 00000000..08baf30b
--- /dev/null
+++ b/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/utils/collections/MultiLevelMapHelperTest.java
@@ -0,0 +1,72 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.utils.collections;
+
+
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+import static com.kingsrook.qqq.backend.core.utils.collections.MultiLevelMapHelper.getOrPutAndIncrement;
+import static com.kingsrook.qqq.backend.core.utils.collections.MultiLevelMapHelper.getOrPutNextLevel;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/*******************************************************************************
+ ** Unit test for MultiLevelMapHelper
+ *******************************************************************************/
+class MultiLevelMapHelperTest
+{
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void test()
+   {
+      Map<Integer, Map<String, Map<Integer, Map<String, Integer>>>> bigOleMap = new HashMap<>();
+
+      Integer clientId    = 120;
+      String  sku         = "BASIC1";
+      Integer warehouseId = 10;
+      String  state       = "MO";
+      Integer quantity    = 5;
+
+      getOrPutNextLevel(bigOleMap, clientId,
+         map -> getOrPutNextLevel(map, sku,
+            map2 -> getOrPutNextLevel(map2, warehouseId,
+               map3 -> MultiLevelMapHelper.getOrPutFinalLevel(map3, state, () -> 0, v -> v + quantity))));
+      assertEquals(5, bigOleMap.get(120).get("BASIC1").get(10).get("MO"));
+
+      getOrPutNextLevel(bigOleMap, clientId,
+         map -> getOrPutNextLevel(map, sku,
+            map2 -> getOrPutNextLevel(map2, warehouseId,
+               map3 -> getOrPutAndIncrement(map3, state))));
+      assertEquals(6, bigOleMap.get(120).get("BASIC1").get(10).get("MO"));
+
+      getOrPutNextLevel(bigOleMap, clientId,
+         map -> getOrPutNextLevel(map, sku,
+            map2 -> getOrPutNextLevel(map2, warehouseId,
+               map3 -> getOrPutAndIncrement(map3, state, quantity))));
+      assertEquals(11, bigOleMap.get(120).get("BASIC1").get(10).get("MO"));
+   }
+
+}
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