setstage [Quest ID] [Quest Stage Number]

Fallout New Vegas Console Commands
Command setstage [Quest ID] [Quest Stage Number]
Description Moves quest in your quest log to the target quest stage. This is a better way of moving past certain parts of a quest rather than using the <span class="command">completequest [Quest ID]</span> to force complete the quest.
Opening the Console To open the console in Fallout New Vegas, press the <span class="key">~</span> key while you are in the game. This key is usually to the left of the <span class="key">1</span> key and below the <span class="key">Esc</span> key. Enter the cheat command then press the <span class="key">Enter</span> key.