Use the wall material settings within the Wall Type Definition dialog to specify horizontal framing members.
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Wall Framing
501 - Framing Wall Corners and Intersections
5239 - Door and Window Framing Controls
10123 - Wall Blocking for Cabinets
336 - Adding Blocking and Bracing
334 - Controlling Wall Stud Spacing and Materials
5304 - Wall Framing Labels
5317 - Multiple Wall Framing Layers
200 - Creating Horizontal Wall Framing
333 - Framing Attic Walls with End Trusses
316 - Designating Platform or Balloon Framing Conditions