Creating a Non-Serialized Free Pick Package that holds permanent contents - Is this possible?

Hi all,

I'm looking to find ways to pair specific barcodes together in one package, however that package does not have a serialized barcode. Rather it is an item on flex "Set A" and when it is dragged onto a quote, it would pull together all the contents that attached together. 

A virtual package does not work because it doesn't allow me to pull specific barcodes together, I can only drag the item category per say and the quantity needed per category. But really I just want to attach a certain barcode, to another barcode because they're a combo item.

In this case I could use the Serialized Free-Pick but the case that it is in, can easily get swapped out and it is not the permanent home for it.