Hi Shafiq,
Right now in Dynamo, you can only create tin surfaces from a Cogo Point Group.
I don’t know how you’re defining your regions/faces, but assuming you can extract the boundaries, i will take the boundaries of the regions/faces, add points every X distance using the point at parameter, turn the points into cogo points, assemble the points into gropus and finally create the tin surface(s). I did a real small example (only one surface) of this here : Polyline3D to Surface. I believe you can follow the same logic.