Ungroup
The Features | Group |Ungroup command or the 
button is used to separate
objects that have been previously combined into a group object using the
Features | Group | Group command.
A grouped object can also be ungrouped in the Contents window by right-clicking on the Group object and clicking Ungroup.
The Features | Group | Ungroup command can also be used on some imported files: Golden Software Boundary .GSB, Atlas Boundary .BNA, USGS .DLG, .LGO, .LGS, AutoCAD .DXF, Golden Software Blanking .BLN, Metafiles, and some pasted objects.