Entries can be copied when you want to create an entry with the same details as an existing one.
How to copy events to a different shared calendar
1. Go to the event you wish to copy.
2. Tap the three dots in the top right-hand corner "・・・" then select "Copy".
3. Select the calendar to which you want to copy the event.
4. Make any edits to reflect entry changes, and tap the save(✓) button.
How to copy events to multiple days
Available from iOS 7.8.0/Android 7.6.0
1. Go to the event you wish to copy.
2. Tap the three dots in the top right-hand corner "・・・" then select "Copy to multiple dates".
3. Choose the days from the calendar (You can select up to 30 days)
4. Tap "Copy event to the selected dates"