Bentley Map contains tools to work with MicroStation 3D solid objects, primarily for urban modeling. These tools convert solids to XFM polygon collection features and back to solids. To properly represent these 3D features:

1. Make sure the feature is a polygon collection feature.

2. Toggle on the Lock mode for the Delete to Parent propagation rule.

   
   
   

   This way, the operation of this lock can be adjusted during editing by using the Graphic Group lock. See the notes under Typical Operations in the Bentley Map help.