I have input around 1000 contacts from a specific country. Most of these are already in groups. I want to create a group for contacts from that country that are not yet in a group. How can I do that? I could not find a way to search for them.
I've done this sort of thing by using the Include / Exclude custom search (Search => Custom Searches => Include/Exclude Contacts in a Group/Tag)
Include a group that has all the contacts that you're looking at. In your case you may need to create a smart group that has all the people in the country. Then in the exclude list all the groups that they should be/could be assigned to. Search. You'll be left with all the people in the country to don't belong to any of the groups you listed in exclude.