Remove from GroupKeyCreator \ Tools \ Non-Geometric \ Group \ Remove-from-Group
Use the Remove Group function to remove selected entities from within an indicated group.
Using the Function:
1 Select Remove from the Tools>Group submenu.
2 Select the entities to degroup, using the Universal Selection Menu. If you select an entity using the Single selection method, and the entity selected already belongs to a group, you must choose whether you want to degroup the entity using one of the following options:
3 Choose ACCEPT when you finish selecting entities to degroup. Group and subgroup references are not deleted from the group list, even when all entities are un-grouped. Any entities you select are degrouped, but the group reference stays in the group table. To remove the group reference, use Delete.