Import .3dm model - edit objects all at once

[Charles C]

Hi community, 

I was wondering if it is possible, once you imported a .3dm (Rhino) model into your Archicad (via merge from file) to Edit all of its objects (automatically converted into GDL) at once ?

I would like to select them all (more then 300 object in my .3dm imported file), and select their floor plan display to "overhead all" instead of projected.

Thanks

CC