Open that file in Excel and sort the events as needed (by keyword, date, etc.) In the Calendar Name column, assign the different sub-calendar name(s) you want for the sorted events. Save the changes to the CSV file.
Import the updated CSV file back into your Teamup calendar. The imported events will be assigned to the sub-calendar(s) designated in the Calendar Name column.
Deactivate the inbound iCalendar feed if its no longer needed.
We recommend that you use one of our live demo calendars to test the import before uploading the file to your calendar. See more details about CSV import here.