Inactive records need to be added to a group manually or by a query. If you need to create a query to locate inactive records refer to this article.

You can use the results to include them in a group that exists or to create a new one. If there is no common element by which you can query all the results you need, then you can enter them into the group manually. 

To find a single inactive record, search under Constituent360 > Constituent with the Include removed (inactive) constituents in search results box checked.

To add the record to a group, click View.
  1. ​​​​​​​Then click on the Groups tab.
  2. Click on Edit Group Membership.
  3. Find the desired group, click on it, and click Save.