You can easily copy workouts shared with a group by dragging and dropping them onto a folder in your workout library. Click the “Library” button to open your library:
Here I have created a Suunto folder:
Drag the part of the workout with the name:
And drop it on your folder. This will make a copy of the workout in your library.
You can also drag the whole folder or plan and drop it in the box at the bottom of you library. This will share it with you. Any changes the owner makes will be visible to you. You won’t be able to edit the workouts but you can just drag the ones you want to change into one of your own folders to make a copy to edit.
More info here: