Material Editor > Get Material or Type button > Browse From group > Select Mtl Library. > File group > Open material library. > File group > Merge > Merge Material Library dialog > Open another material library or a 3ds max scene. > Merge dialog > Select materials to merge > OK
The Duplicate Name dialog is displayed if, after you click OK in the Merge dialog, one or more materials to merge have the same name as materials in the open library.

Material name—At the right, the dialog displays a duplicate material name. You can edit the name to make it unique before you merge it with the open (current) library by clicking the Merge button.
Apply to All Duplicates—If you turn this on before you use the buttons, all subsequent incoming materials with duplicate names are treated the same way as the current one, and no further alert messages are displayed.
Use this option when you know that you've got several duplicate materials, and don't need constant reminders.
This check box is unavailable if you edit the material name.
Merge—Merges the material with the open, current library. This button is unavailable unless you edit the duplicate name to be a different, unique name.
Skip—Skips this material and doesn't merge it with the open, current library.
Delete Old—Deletes the "old" material in the open, current library and replaces it with the material to merge.
Cancel—Cancels further merging of materials with duplicate names. If you have already merged some materials, they appear in the open, current library.
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