sorry for the post but could not find how to clear it. I found what I needed.
But I have a problem:
VAT 10% : [=F(TN(‘{TICKET TOTAL}’)*0.1)] €
TOTAL LESS VAT : [=F(TN(‘{TICKET TOTAL}’)*0.1+{TICKET TOTAL})] €
can fix it? the total less tax must subtract 10%