Controls the list of scales available for layout viewports, page layouts, and plotting.
The following prompts are displayed.
Displays a list of defined scales.
Adds a new scale to the scale list. Enter a ratio in the format n:m, where n is the number of paper units and m is the number of drawing units
Removes a specified scale. If a scale is current or supported by an annotative object, it cannot be deleted.
Deletes all custom scales as a result and restores the default list of scales.