You can add already existing or new constituents to a group in Luminate Online.
  1. Create a Group
  2. Locate the Group ID
  3. Create a .csv which includes at the bare minimum a column to identify the constituents (either by Cons ID or Email Address) and a second column of the Group ID number
  4. Perform a custom constituent import, electing in the data decision step to add new constituent records or update existing ones
  5. Refresh the Group Summary