An invoice is made per customer, not per piece. You first collect everything that customer is taking into a basket, then turn it into one invoice.
A customer rarely buys one thing. The basket lets you gather it all before creating anything.
While scanning: click 🧾 Add to invoice. Or from your stock: tick the rows and choose 🛠️ Actions → under Other → 🧾 Add selected rows to invoice.
The number in brackets says how many pieces are in your basket. If it shows zero, nothing has been added yet and the button does nothing.
At the top of the sales screen look at 🧾 Create invoice with the number beside it, and click it.
This is your last chance to see whether anything is missing or one too many, because after this it becomes a real document.
Read through the list under These items will be added to the invoice.
The name goes on the invoice. The email address is optional, but without one the invoice cannot go out to the customer.
Fill in Customer name, and optionally Customer email (optional).
If you work with Odoo, the app creates a draft invoice there directly — nothing to retype. With another package you get a CSV file that almost any accounting program can read.
Under Accounting program, choose between Odoo (directly) and Other program (download a CSV file).
Otherwise you have to edit every piece separately afterwards — and that is exactly when one gets left behind in your public catalogue.
Tick Mark these items as sold immediately and click Create invoice.
These pages are free and will stay that way. If you would rather have someone look at your own stock with you, that is available as paid guidance.