Material Editor > Put to Library
Material Editor menu > Material menu > Put to Library
Put to Library adds the selected material to the current library.
A Put to Library dialog is displayed, which lets you enter a name for the material that’s different from the one you used in the Material Editor.
The material becomes visible in the material library display in the Material/Map Browser. The material is saved to the library file on disk. (You can also save a library by using the Save button in the Material/Map Browser.)
To save a material in a library:
Click to select the sample slot that has the material you want to save.
On the Material Editor toolbar, click Put To Library.
A Put To Library dialog is displayed.
Either change the material name or leave it as is, and then click OK.
The material is saved in the currently open library. If no library is open, a new library is created. You can save the new library as a file using the Material/Map Browser file controls.