zingFit offers support for listing a substitute instructor. When creating or editing a class in the Scheduler, select "Instructor is Substitute" to the right of the main instructor selection drop-down menu.

The Instructor is Substitute selection triggers the appearance of an additional drop-down menu to select the regularly-scheduled instructor ("Regular Instructor"). An "s" icon will appear adjacent to the name of the substitute instructor on the public reserve schedule. Hovering on this icon will display a pop-over message displaying the name of the Regular Instructor.