We set up class periods in our Bell Schedule on Red Rover. When creating an absence we require employees to select check the class periods they need sub coverage. Currently this is not possible on the mobile app for iOS and Android.
Including this feature in the mobile app would assist those who need to submit an absence request but are not near a computer.
Note: you can do this logging into Red Rover using the mobile browser on a phone, but the experience is not optimized for phone screens and requires a lot of scrolling.