Premium users of Stages Link can use the workout builder template to create their own workouts, add them to their training calendar, and sync them with Stages Dash. Existing workouts within the workout library can also be dragged onto your training calendar and modified as needed. Once you've added the workouts to your calendar, use Stages Sync or the Stages Link app to sync them to your Dash unit. 

Stages Link help: 

How can I create or edit my own workout?

Sign up for Stages Link