How can I manage different delivery methods for two products?

Hello,

We have 2 products that we are going to sell.

Now 1 of the products will be done thru amazon, basically everything stocking, delivery…
The 2nd product will be done by us.

Now our problem is while we are implementing amazon, we dont see an option to have 1 product be amazon and the other one handled by us.

How do we do that? Any guides anyone can link us to?