Could you please help me to build a model in COMSOL?

Could you please help me to build a model? I can provide the geometry file and the details of the simulation. The pic 1 shows the current model I have, I want to simulate how the hydrogen gas transport from one pore to another pore and get the streamlines. Pic 2 shows what I wish you to do. I wish to extend the inlet and outlet, the inlet and outlet boundaries are both the top of the pores. I also wish to consider the hydrogen consumption at the platinum layer due to electro-osmotic drag.