1.Go to Store->Configuration->Zestard Tecchnologies->Duplicate Categories->Module Enable->Yes

2. Go to Catlog->Categories
Click on the category which you want to duplicate.
Click on the  Duplicate Category button

3. Select the parent category from the  Select Patent Category dropdown. Select Yes from Copy Product Relations to replicate the product relation. Select Yes from Include Subcategories to duplicate sub-categories for the new category.
Click on  Duplicate button to duplicate category.

4.Result of the newly replicated category