have different quality for textures of game objects in one scene

hi

how can i have 2 game object in my scene with 2 different quality level ?

i have one choice in quality setting . full resolution or half or quarter or etc . here is the 1 of quality setting .

there is image i upload that help me explain better :

the right side is full resolution and left side is half . i want both of them ! i want one wall have full resolution setting and others have half resolution setting ! it help me run the game faster in mobiles !

** excuse me for my bad english **

Set Texture Quality to Full Res. Duplicate the Texture, and in the Texture Importer settings, reduce the resolution for the duplicate.

Alternatively, you might be able to utilize Texture.mipMapBias