CHSPACE command
Moves entities from paper space to model space and vice versa.
                Note: This command can only be used in a Paper Space.
            Method
There are two methods to use CHSPACE command:
- Moves entities from paper space to model space.
 - Moves entities from model space to paper space.
 
Options within the command
Note: The following options are available only with multiple
                    viewports active
            - Select TARGET viewport
 - Select target viewport as reference.
 
- Select SOURCE viewport
 - Select source viewport as reference.