How to make a equip inventory?(like 1,2,3)

hi, i have a inventory like this, i want to do a 1,2,3 widget for equipping the items. i have 2 problems;
i can’t drag the items,
i don’t know how to connect that 2 inventory for transfer the item.
i know this topic is not very explanatory but i don’t know what to write. if you ask me questions about the inventory i can answer it
immediately. thank you for helping.