Assigning Items

(Get Item At Index on InventoryComponent)
   ↓
Assign Item To Slot on HotbarComponent
   Item Instance = [Inventory item]
   Slot Index    = [Target hotbar index]
   Return        = Success? (bool)

FItemInstance Item = InventoryComponent->GetItemAtIndex(InventorySlot);
bool bSuccess = HotbarComponent->AssignItemToSlot(Item, HotbarSlot);

Make Item Instance
   ItemID   = "HealthPotion"
   Quantity = 5
   ItemData = DA_HealthPotion
   ↓
Assign Item To Slot
   Slot Index = 1

FItemInstance HealthPotion;
HealthPotion.ItemID  = "HealthPotion";
HealthPotion.ItemData = HealthPotionAsset;
HealthPotion.Quantity = 5;

HotbarComponent->AssignItemToSlot(HealthPotion, 1);

Clear Slot But Keep Sticky
   Slot Index = X

Clear Slot And Sticky
   Slot Index = X

// Clear but remember sticky ID
HotbarComponent->ClearSlotButKeepSticky(SlotIndex);

// Clear completely
HotbarComponent->ClearSlotAndSticky(SlotIndex);