Telescope Line Editor command (Telescope menu)  

The Telescope Line Editor command allows you to use your telescope to generate a custom horizon or create custom declination and altitude limit lines. Using this tool will cause the associated edited line to snap to the current telescope coordinate.

The telescope's Motion Control command can aid in the process of generating custom horizon or limit lines. It allows you to move your telescope in a specific direction, in specific increments, in either horizon or equatorial coordinates.