You can create multiple calendars on IPS4 from within the admin CP. You would so this by visiting the following location.
When visiting this area, you will see a page similar to the below image. Select "Create New" to create a new calendar.
Once the "Create new" link is selected, you can enter a name for your new calendar, along with with your preferred options
After selecting save, you will then be given the option to set and save the permissions required for the calendar you have just created.
You can get back to the permissions menu by selecting the lock icon in the calendar list. You will find this is the case in many areas of the IPS4 products.