split boundary
 

hi, i m doing CFD of a pump
I imported surface model and consider as one region for all boundary
i have prepared all boundary,
I am facing a problem at interface place.
I am unable to split the boundary at interface between stator and rotor

See the picture for clear understanding
these geen and brown color are the boundary which i want to split and gray one is the interface.

Bottom portion is of stator and top one for stator.

I am stuck here at the day end,
Please help me

thanks