Hi @Luyz, to achieve this you’re going to need a table for line items I’m afraid. I’ve put an example together here
You’d have a Products
table with product information, including the price:

A Line Items
table where you would put in the Quantity sold where each record was linked to a Product

And a Sales
table where each sale can be linked to multiple Line Items:

This would allow you to set the quantity per product and get the correct total!