Migrate Appointments+ to a new site

Good afternoon,

We wish to move our Appointments+ calendar/appointments from one multisite subsite to another on the same multisite network. I read on these threads there is an export but no import feature. Is there any other way to do this so I wouldn't have to re-enter everything on the new site (wordpress importer, database copy, something else)??

Main Site (multisite network)
---> SubSite 1
---> SubSite 2 (where Appointments+ is installed now)
---> SubSite 3
---> SubSite 4 (where I want to move Appointments+ without losing all my appointments)