Hi Penny,
I’m not exactly sure of what you mean by “top front rail” but i’m going to assume you are referring to Framed Cabinetry.
If you want to show the top frame on the cabinet, then you can go into the attributes of the item and open the drawer to see the rail. See the attached image. Also the catalog that I have used for this example is Sample_F.
Hope this helps!
Kris