If you need to create a large number of sub-calendars, it may be more convenient to structure and prepare a .csv file, then bulk import it to your calendar.
When importing from a .csv file, the fields need to be named correctly (case sensitive) and the data needs to be in the correct format. Then you save as a CSV file and use the Teamup import tool.
Here is an example file for importing, in Excel and CSV, which you can use as a template:
This article lists the supported fields for CSV format. Make sure that your subscription plan allows the number of sub-calendars to be created from your bulk import.