Also the ability to add text for things like reverse billing countries, and for adding additional lines or comments per invoice based on criteria like line item is not 0

This is my form from Moon Clerk, Please see my page attached, I want to recreate this on Billsby

Especially: please allow removal of "Discounts" column. We don't offer discounts. It's a bad look on the invoice to see "Discounts: $0" - customers look at that and think... should I have gotten a discount? It's reminding them to ask for something that doesn't exist - and instilling doubt in the pricing.