How to change Pipe segment Diameter?

[fernandoomi]

I would like to know how can I change the Pipe Diameter from a piping segment.



I made my design not using the "Spec Driven" option.



I tryed going on "Modify", in modify Options marked "Line Stock", then I selected the segment, and finaly on the "Modify Linestock" I changed from the 4 inches to 3 inches as I needed. The problem is that the Ok button is greyed-out. I even tryed to create a new and added a new linestock it stays the same.