Yes!
If you want to duplicate an already existing Plan, go to the three-dot menu for the Plan by following the simple steps below:
Click your profile picture in the top right corner.
Click "Admin".
Scroll down to the "Plans" heading > click "Plan List".
Hover over the plan you'd like to duplicate > click the three-dot menu > click "Duplicate Plan".
You will be able to edit all the details of the Plan including price, name, interval (monthly, annual, etc...) details, and much more!