You need to add a place where the items you want to sell will be displayed in your store widget that you already have.
And you don’t have to (most likely don’t even need to) create several widgets to sell different products. You can limit the set of products sold when creating an instance of the widget (if your stores differ only in the list of products).
This is like a pawn shop counter. You put everything you want to sell on it (items from your inventory are moved onto the this map), and then you sell everything on the counter by pressing a button.
Here’s a good explanation:
After changing the inventory map, you need to manual refill the Vertical Boxes.
Call Clear Children for them and run the Loop again on all items in your inventory, as well as on all items “on the counter” and create widgets for each item again.
First structure Data Table reference + Name
You will need to use it as a key in your inventory map and shop counter map.