It’s easy. See the attached images. First, check the “Bottom Rail Draw?” checkbox on the Face Frame tab. Subtract the thickness of the Bottom (3/4″) from the Bottom Rail width (1 1/2″) and set the “Bottom Inset” default on the Base Cabinets tab for that amount. Note one the face_frame_tab.jpg attachd that you have to adjust the Drawer Front Heights because you added the Bottom Rail. Be sure to click Update after each change on any tab.