Need help with design table with assemblies

Hi,

The work i need to do is woodworking oriented.

I want to do different sizes of cabinet doors. I wanna start with a really simple assembly : 4 pieces.

I already know how to work design tables with part documents but im totally lost with design tables in assembly.

I don't know where to start. Basically I want the rails and stiles to adjust depending on the overall size of the door.

So 2 pieces will be changing.

Can anyone help me.

Thanks

Ps I included a little screenshot of the door

SolidworksConfigurations design Tables