How to make a collection of products into a new product?

[i-make-robots]

I have Kit A that has 2 part Bs, 4 part Cs, and 1 part D. All items A-D are available in my store.
When someone buys Kit A I'd like the packing slip to show 2 B, 4 C, 1 D, and to reduce the quantities accordingly.
Is this doable with the default system? If it isn't then I need to come up with a way to do this so I can stop recounting my inventory.

Thank you!

[kobra]

It is not possible with the default code base