Custom price for two products (pack?)

[Bugas]

Hi,

i'm making a module that combines products in packs. I can't figure out how to make a cart rule or something that will change price when specific products are added to the cart.

For example:

Car costs 1000euro, Tires cost 500euro, Seat cover costs 100euro... when those three are aded to cart, the price of seat cover should be 1 euro instead of 100...

 

As I see, the best way should be a cart rule with (as in our example) three cart rule product groups... so how should I do it?

Can i do it with a Cart Rule Object, some function or should i manually insert values into sql tables?

Some example code would be much appreciated

Thanks in advance

 

Edited April 8, 2019 by Bugas (see edit history)

[Bugas]

Hate to sound despaired, but any - even the shortest answer (leading to a solution) would be much appreciated