Allow users to add supplies onto existing records.

Models/Supply/SupplyRequisitionHistory.cs

@@ -0,0 +1,8 @@
+namespace CarCareTracker.Models
+{
+    public class SupplyRequisitionHistory
+    {
+        public string CostInputId { get; set; }
+        public List<SupplyUsageHistory> RequisitionHistory { get; set; } = new List<SupplyUsageHistory>();
+    }
+}

Models/Supply/SupplyStore.cs

@@ -0,0 +1,8 @@
+namespace CarCareTracker.Models
+{
+    public class SupplyStore
+    {
+        public string Tab { get; set; }
+        public bool AdditionalSupplies { get; set; }
+    }
+}