can't you select a base molding to use in the position of the chair strip?
Use the Parameters tab where it can be easier to choose the trim piece, a base style trim? and set the Base Molding and Crown molding to '0'
HTH
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"