use heartrate and power alternating as primary goal of workout

As I do not have a powermeter on my bike, I use heartrate zones on my outdoor workouts. But recently I have bought an Elite Direto which does have a powermeter integrated. 

So now I would like to be able to use heartrate or power as primary goal depending on whether I am training indoor or outdoor. 

Is there a way to make an easy switch between the two on my Edge 840? 

And is there a way to have the workouts which are made by the 840 self, have both included?