"setstage <questid> <stage> Sets the current stage of a quest Quest stages can be found on each individual quest page. First, select the quest you want to change in your journal. Use the SQT command to see the quest id, then use the getstage command to see the stage. Usually you add or subtract 10 to change the stage, but there are exceptions."
That's for oblivion, but I'm guessing they'll be similar given how CAQS is carried over.