Change style of cell

Hi! I try to change style of cell. I need to draw left, right, top border like “none” and bottom like “bold”. This my code:

I can’t understand: what element i need to Unwrap?


Check out archi-lab (BumbleBee) package for cell settings.

Thank you! It have given some ideas for me. My code now:

There is no errors, but it is not work =(