Cannot combine timers

I workout to beach body videos with timers for warmups, circuits and cool downs. I want to start creating my own workouts, but want to keep the tempo style I am used too. I thought this app would allow that, but I do not see how because you can set a warmup time, but then thats it. You would have to stop your workout and then create another timer with work & breaks for the actual workout then yet another for cool down (iOS 8 hides most of my view while writing this so typos are because of that).

JasonStPete about Pacer Fitness - Interval Timer