Dependent product variation type

Question

I have a question. My site sells tours. For each tour(product) a user can choose a flight and some hotel rooms. Example tour1: user can choose: flight1 and flight2. user can choose: double rooms and/or single rooms.
If the user choose flight1 then -> double rooms costs 50, single rooms costs 100(a). If the user choose flight2 then -> double rooms costs 150, single rooms costs 200 (b). I have 3 dependent variation types(flight, doubleRoom, singleRoom). What I want is: if the user choose flight1 I only show double rooms = 50, single rooms =100 (rooms(a)); if the user choose flight2 I only show double rooms = 150, single rooms=200 (rooms(b)). Flights and rooms have a taxonomy terms called 'solution':solution1, solution2 ecc.. I think that a way should be use rules, with event 'After adding a product to the cart' but I can't write the condition('if flight choose solution1') and the action(set visible=true where rooms solution= solution1). Can someone help me please?? Thanks in advice

Answer 1

I am looking for this for Drupal 8, however it appears that the module Commerce Product Add-on provides a solution for Drupal 7 (I have not tested it).

Commerce Product Add-On allows users to attach products as options to the add to cart form of another product. This is particularly useful for things like event sponsorship, optional accessories, and other up-sells.