Use the Explode command to break a complex object into its component entities. You can explode Blocks and other complex objects like PolyLines, Hatches, and Dimensions.
Initially, you cannot edit the individual entities that make up a Block or other complex object. If you need to edit one of the entities comprising a complex object, you must explode it into its individual entities.
To explode complex objects:
The selected objects are exploded. You can edit the individual objects.
If attributes were attached to an exploded Block, the attributes are deleted. Instead, the attribute definitions appear.
Access
Command: Explode
Menu: Modify > Explode
Ribbon: Home > Modify > Explode