How can I print labels with a unique number for Christmas tree sales?

This document describes how to create a product list with reference number.

Such a product list can be used to print slot labels related to the sale of, for example, Christmas trees.

Step 1: Create a new product list.

 Step 2: Add product(s) to the product list.

Step 3: Check the line and choose "Copy line":

Copies of the selected line will then be created and each line will have its own reference number:

What remains now, is to print the thermal labels (slot labels with reference number).