ok this one is complicated. When I was using "the other program" won't mention the name, it allowed me to add the GSt on purchases within my sales invoice.
I need to do the following with each sale
Total sales, less GST of course
less advertising (ends up of course debiting this expense when you put minus on the invoice)
less royalty (ends up of course debiting this expense when you put minus on the invoice)
normally I would add a line to subtract the GST on purchases. Now I"m stumped as how to do this because its a sales invoice...