A drawing can contain as many coordinate systems as you want and can be named appropriate names so you can remember how they are used in your drawing for recalling them later.
NOTE Coordinate system names created or renamed in ZWCAD can have up to 31 characters and cannot include spaces. ZWCAD will, however, display longer coordinatesystem names and names containing spaces.
Define new user coordinate systems
Choose Tools > NEW UCS.
Choose which type for creating UCS.
Create UCS depending on the prompts.
Command line UCS
To change a user coordinate system name in the current drawing
Choose Tools > Named UCS.
Right-click the desired UCS name and select Rename.
Type a new name.
Click OK button.
Command line DDUCS
UCS: Manages user coordinate systems
UCSICON: Manages user coordinate systems
UCSMAN: Manages defined user coordinate systems
System Variables Reference
ERRNO: Displays the number of the appropriate error code when an AutoLISP function call causes an error that ZWCAD detects
PUCSBASE: Stores the name of the UCS that defines the origin and orientation of orthographic UCS settings in paper space only
UCSFOLLOW: Generates a plan view whenever you change from one UCS to another
UCSNAME: Stores the name of the current coordinate system for the current viewport in the current space
UCSORG: Stores the origin point of the current coordinate system for the current viewport in the current space
UCSXDIR: Stores the X direction of the current UCS for the current viewport in the current space
UCSYDIR: Stores the Y direction of the current UCS for the current viewport in the current space
UCSICON: Displays the UCS icon for the current viewport using bitcode
UCSVP: Determines whether the UCS in active viewports remains fixed or changes to reflect the UCS of the currently active viewport