Create Bounding Solids
Use the Solids: Bounding tool to create solids from enclosed surface volumes.
- 
                From the Geometry ribbon, click the Solids > Bounding tool.
                

Figure 1. - Optional: 
                On the guide bar, click 
 to define additional
                    options.
             - 
                Select bounding surfaces in the following ways:
                
- On the guide bar, click Find to detect bounding surface
                            sets.
Review each found/selected bounding surface group by clicking
 and 
. - Left-click on bounding surfaces in the modeling window.
 
 - On the guide bar, click Find to detect bounding surface
                            sets.
 - 
                Create bounding solids.
                
- Click Create All to create bounding solids from all found/selected surface bounds.
 - Create individual bounding solids by left-clicking on a selected bounding surface.