Tools Tab > Material Database Editor 
Allows you to add custom materials to the user material database.
The Material Database Editor does not modify the data in the material database delivered with TANK. The software saves any custom materials to a secondary database, named umat.bin. TANK saves this secondary database in the \System folder.
To select custom materials in TANK input, you must merge the custom materials (that is, those saved in the umat.bin
file) back with the TANK material database using the Merge Material function.