Re: Altium net name
Select all of the net names to which you want to add "_P". Open the Inspector Panel (shortcut F11). Go down to where it says "Text <...>" and click to select that line. Now click on the elipsis (...) on the tab at the right of the selected line, and go to the tab that says formula in the dialog that pops up. In the blank on that page, enter "!+_P" (without the quotes) and hit Enter. All of your selected net names will now have _P added to their names.