When viewing an invoice, in the Add subcategory, select Other from the drop-down menu.
Enter the billable item code you created in the application preferences for a quick search, or its description if you prefer, then select your billable item to add it.
A new line is then added to the invoice.
The Tarmed view allows you to view more details.
Be careful if you modify the price in the invoice, this will be saved as a new price for this material for all invoices. We advise you to change the price only from the Settings > Billable item menu.
To delete a billable item, click on the red cross that appears on the right when you hover over the line with the mouse.
