I want a straight cut the bottom round pipe (without extention), like in 2nd and 3rd example to the right. But I can't figure out how to do that in weldment using Trim/Extend command. 

Trimming command doesn't produce expected result. And all other options failed to produce desired results. It always ends up in ejxtention around the Perpendicular pipe.

Maybe someone has a solution for this? Thank You!