You can set up more than one calendar in My Shift Planner.
-Tap on the Calendar Icon
-tap on Other Calendars
-Alternatively, Swipe up on the Screen to bring up the Personal Calendar Menu.
-From here you can set up a new calendar or choose to overlay two calendars onto each other.
There is currently no limit to the number of calendars you can add.
Please note, this feature is only available in the Pro-Pack add-on.