Select By Material allows you to select objects based on the active material in the Material Editor. This command is unavailable unless the active sample slot contains a material used in the scene.
Choosing this command opens the Select Objects dialog, which works like Select From Scene . All objects that have the selected material applied to them are highlighted in the list.
To select objects that have the same material applied:
White corner brackets indicate materials that are in the scene.
This button is unavailable unless the active sample slot contains a material in the scene.
The Select Objects dialog opens. The names of objects with the active material applied are highlighted.
You can also change the selection by choosing other objects. If you change the selection, you must then click (Assign Material To Selection) to apply the active material to newly selected objects.