well already tried that, but can't add a serial no column. 2ndly, as per local law of our country, the word "TAX-INVOICE" must be written at the top of the sale receipt/ invoice , how to add that ? Instead of unchecking in the store config, invoice is always printing with browser header and footer.
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'Lazy people will always find a short-cut for a difficult task"
Click submit twice on the receipt page once you have it setup correctly. You can sneak tax-invoice at the top by placing it above the business name, in other words type
tax-invoice then underneath the business name
it might be easier to do that in a text editor first then copy and paste into the box. there are probably a bunch of other ways to do that kind of stuff as well, you'll have to mess around with it a bit.
No it isn't, you can change it to whatever you want, your stock level has to be more than 1 for one thing, 2 you can change the quantity on the fly when you enter your order, once you change your value you click edit, not before.