selling Airline tickets is a commision based thing, or flat rate thing, this means i may sell 2 tickets on the same plane , both economy class, both sits next to each other , but one cost/sell 800/1000 , and another one is 1600/2000, so when invoicing each of these client i will have to go to the items menu and change the cost and selling, otherwise i can never know my true profit.
someone suggested me that i create a new item each time i create an invoice that would be easier BUT this way i will be having 73450 items in my items menu in 3 months,
so i suggest that we should be able to create a flexible cost/selling item that on each invoice will be asked to introduce a cost/selling price, and we can create a % commission based items and flate rate commission , all these three items are required in my case to run my travel agency, thanks