➡️ If you're using LSP.expert V1, click here.
When you're in the invoice/quote screen, you can click on the three dots at the end of a line to indicate that this line isn't subject to taxes.
You'll then see a message indicating that the line isn't subject to taxes (this note will also appear in the PDF document).
If you're using LSP.expert V1
When you're in the invoice/quote screen, click on the Edit icon (the pencil) at the right of the line concerned. Then you simply check the corresponding box.
After you closed the Edit mode, you'll see a blue note indicating that the line isn't subject to taxes (this note will also appear in the PDF document).