Indeed, you are asking it correctly and I know what you’re trying to do. I’ve had two projects in the past year where I’ve had the same need. We are looking to add this feature in CabWriter 3.0, but in the meantime, the only solution is to use native tools if you need to pull the rails and stiles above the top of the cabinet. If you want to add an additional scribe allowance to show up on the cutlist, you can select all of the parts and open the Extended Entity Window and manually add additional width to the rails and additional length to the stiles.
I hope this makes sense; let me know if you have other questions. Do you have CabWriter Home or Pro, or are you evaluating the free trial?