Merge #activities before adding them as training.

If I do a Free ride + an event + a free ride on zwift to mimic a join training, I want to be able to add it as 1 training in join so that the workoutscore is based on the whole package. I do know that the fitness score is already determined by the 3 separate training sessions. But I would also like to know one workoutscore for the 3 sessions together.