You can do this with EBC on Android but not iOS.
The steps are Stop the workout and select End Workout instead of End Activity, then select next workout and start that.
The activity ends up named after the first workout. If it was an important change, I’ll edit the title or description afterwards.
What I am usually doing is extending ride time by adding a short low-intensity workout.
Other times I may have started a workout, realize it’s no-go before the first set, and switch to something easier to meet my XSS goal for the day.
You might also use this feature with an idea I am about to propose. 
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