How could I design the concrete shear wall for seismic lateral load combination with Rho=1.3 and vertical seismic load transferred to these concrete shear walls from above podium slab with omega at the same time in Etabs?
I think you can by creating two different sets of load combinations: One with Rho and the other with Omega. Then assign design load combos accordingly in Shear Wall Design/Frame Design/Slab Design.