Should you need to negate (include a bar over the top of) a net label, sheet entry or port, this can be done in one of two ways: Include a backslash character after each character in the net name (e.g. E\N\A\B\L\E) Enable the Single '\' Negation option on the Schematic - Graphical Editing page of the Preferences dialog, then include one backslash character at the start of the net name (e.g. \ENABLE).