how to define a specific corner in the setup

Hi,

Due to my application, I would like to define a corner group comprising the following combinations

1. FET_FF, RES_FF, CAP_FF

2. FET_SS, RES_SS, CAP_SS

3. FET_FS, RES_TYP, CAP_TYP

4. FET_SF, RES_TYP, CAP_TYP

The classical way will create 16 corners in total, in which there are 12 corners are not needed. 

Is there any efficient way to define such a corner group? Maybe a customerized model?

BR