Library
Store reusable layouts, intervals, alerts and zones in the Library. Link an item to several workouts to manage their shared configuration in one place: edits apply to every linked workout.
Creating
Open the relevant library and choose Create (in the phone toolbar). Select the workout to copy from, name the new item, then edit it as needed.
Managing
Long-press an item to enter list editing. On phone, select items and use the bottom action bar; on Wear, open the item's context actions while editing. Available actions include renaming, copying, moving up/down and deleting. Choose Done to leave editing.
In a workout, tap the library selector beside a configuration section to choose a shared item. The current selection is highlighted.
The screen template chooser also collects individual screens from custom library layouts. Those templates create independent copies; they do not create a library link.