DMRIGIDSET3D command
Allows to define a set of entities or subentities as a rigid body.
                Icon: 
Method
Select a set of edges, faces or 3D entities that will be linked as a rigid body.
All members of a rigid set are moved (DmMove command) and rotated (DmRotate command) together, while their relative positions within the rigid set are preserved.
Press the TAB key to select obscured geometry.
Options
- WOrld
 - Allows you to select the WCS subentity as an argument.
 
- BLock
 - Allows you to choose, as an argument, the subentity of the coordinate system of the block.