Easier way to conditionally tie services together

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Hi, i would like for a way to easier tie services together with conditions rather than to have to code for it. For example if services 1& 2 are in the cart, service 1 gets a discount, or service 2 cant be bought without service 1 for example. More important is that the services have functions as most common would be purchasing both domain and hosting but when both are bought together, domain is free or cant buy separately (shared hosts apply this as a domain is necessary so either has to be transferred or bought).

Another possible situation is say you offer a web design service and hosting service as well, that if you have the design service as an addon to the hosting service as well, that it would be discounted when bought together.

Would like to request such features for increased flexibility without having to code for it.