Still not clear. What you might want to do is to make a List of products using a List.Try Sajal's tutorial https://imagnity.com/tutorials/app-inventor/list-blocks-on-app-inventor/
You might want to save the List of products to a TinyDB or a Google Spreadsheet. How you do this depends on what you want to do in your app.
Here is a possible similar discussion you could adapt to your needs Comment attribuer un prix à un élément d'une liste (Caisse enregistreuse) . There is an aia.