Implement Duplicate / Copy listing button for Frontend / Backend
1) Frontend part
Duplicate / Copy listing button should be placed only on 'My Listings' page near each listing.
When you click on this button you'll be redirected to Add listing page and all the fields will be filled with the data of the listing you clicked on Copy button.
2) Backend part
Duplicate / Copy listing button should be placed on the 'Listings' page in the grid near each listing.