Integrate

I integrated the invoice with the inventory

To add my inventory, I need to use the fact that I purchased the item, In fact, I do not want to type in inventory again. I need the goods from the invoice purchased in the invoice item table.

Can i do it?

I have invoice item sup table.(it is The goods purchased from the seller)

How can this relationship be established and when the product is selected in the inventory, show the items that I bought from the seller.