If I understood you correctly, you need to separate out the parts of the model by layers.
Take a look at the sample projects that came with ArchiCAD in the 'ArchiCAD Examples' folder.
You can open up the layers settings box to see how the different layer combinations can easily control which elements show where.
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"