Sorry for the potentially elementary question here, bur I have seen this done by a former coworker. I can't for the life of me remember how to use a CSV or comma delimited string of CiviCRM IDs to create a new mailing group through the CiviCRM user interface. I have a list of existing contacts from our database that has been filtered inside Excel and now I need to create a new group off the remaining contact IDs.
Can anyone remind me how to take the CSV list to create the search and then generate the new group? Or do I have to run the list through the "Import Contacts" process and add them to a group that way?
Thank you in advance.