- In the home sheet, create a column that’s filled with true whenever the user is paid up.
- In the class sheet, create a template column with a value that’s always true.
- Create a related from the class sheet to link the true template to the true column in the home sheet.
- Create a lookup column in the class sheet to return all emails from the relation that are set to true.
- Set visibility and filtering checking if the lookup column is signed in user.
Further discussion on this thread: