Basic tutorial on how to add another Inventory tab
1
Add new Inventory Tab enum
Open E_InventoryTabs and add new enumerator, in this example we will add Extra 4 tab and re-order the rest by making Weapons a separate tab. Depending on your project scope you may just need to add another tab and don't worry about the rest.
2
Adding New tab to the Inventory Component
Open AC_PlayerInventory then go to Class Defaults and add another element to the Inventory Tabs variable. In this example we will re-order the Item Types by moving the Item.Type.Armor to Extra 1.
3
Adding another tab button to the UI
Open WBP_PlayerItemContainer, duplicate one of the Button Tabs and change the Tab Enum on it. In this example we will also change the button icons so that Weapons and Armor are separated.