[chimerax-users] Coloring pdb surface by different colors

Hi I have a pdb with 10 TMH (single polypeptide protein, so only 1 chain in pdb). The first TMH are colored in green and the rest in yellow. Is there a way to create a surface that consists of both these colors? i.e. Surface corresponding to TMH's 1-5 is colored in green, while the surface corresponding to TMH's 6-10 in yellow? I tried the surface command option but it seems to color the entire surface in a uniform color. Any suggestions would be very helpful. Thanks Yaikhomba