This is critical for applying taxes properly to individual line items.

Ticket#2855634

This is more than a "nice to have" because it matters for taxes. Right now, adding a discount at the invoice-level, the discount is taken off each item proportionately. The problem with this is that when some items are taxable and some are non-taxable, the discount is taken off both items.

For example:

This should result in:

$100 - $100

+ $100

+ tax on $100

However, right now, it is this:

$100 - $50

+ $100 - $50

+ tax on $50

And the discount is not customizable.

Also important for accurate accounting reporting, my income for Design Service Fee should show $0 on this and my income for Printing should show $100.

I tried the workaround that works in other invoicing systems which is to set a negative quantity, but that did not work. However, I was able to set a positive quantity with a negative amount, so that's the workaround I'll be using for now. Still, this does not allow me to run a report for how much discount I've given in a year.

Related: https://ideas.gohighlevel.com/invoicing/p/multiple-line-item-discounts-on-invoicesproposalsestimates

This would be invaluable for larger proposals. i.e. You include 10 products in a proposal, each product could then have a different discount attached to it.

You might want to discount an implementation charge (and show the fact that it is discounted) but not discount the ongoing monthly subscription charges.