I'd like to use the accounting module for a small travel agency. As some of you may know, the prices of ticket is always subject to change, depending on the time of destination and the number of flights booked.
As such, I'd like to ask how I may:
create products without a fixed price
add a drop-down box where I can choose multiple departure and arrival locations (which I can add to on the fly, if need be)
How may I accomplish those? Is there any addons or the likes that'll allow me to do those or do I need to get my hands dirty with the code and get my own SQL columns and form fields? If it's the latter, please show me where I can get started on those areas.