Selling multiple items under one listing

hello I'm not sure the exact term for this but hoping someone can help

This is an example. But let's say I want to sell a bed on amazon and it comes in 3 parts.

Legs

Frame

Mattress

Now I know it's possible to list it as one item and one unit... And send it in to fba as one item all packaged together.

But is it possible to send it in 3 units with 3 skus... So people can buy each bit individually. But they could also buy the whole bed as package which is made up of the 3 different skus. So when someone orders the whole bed... Amazon will send the 3 skus up that make it.

Hope this makes sense! But if this is not possible what is the best way to achieve this.