Users can be added to multiple published binders from their profile.
Select Users > App Users:

Select the users name:

Select Add Binders:

Select the binders to add the user to:

Select to add the user as an Attendee or Recipient:

Select Start:

Users can be added to multiple published binders from their profile.
Select Users > App Users:
Select the users name:
Select Add Binders:
Select the binders to add the user to:
Select to add the user as an Attendee or Recipient:
Select Start: