Hi, I have 3 queries:

1. I wish to print/show "GST No." instead of "Tax Number"
2. I want to print tax type (in my case "GST%" on the invoice)
3. I also want to print "customer's GST No." if any, on the invoice alongwith his contact details.

Where do I need to do the changes?

Kindly respond ASAP, this is urgent. Thanks.