Follow these steps to duplicate an ad set in the Launch Ads section:
1. Click on the Launch tab from the left-hand sidebar.
2. Click on the + Load Media button.
3. Choose the creatives you want to launch by selecting the checkboxes next to them.
4. Once the creatives are loaded into the Launch grid, click on the Bulk Edit dropdown at the top right.
From the dropdown, choose Ad Sets.
5. In the pop-up, click on Duplicate Ad Set.
6. Select an existing ad set from the dropdown list to duplicate.
7. Enter a name for the new ad set under New Ad Set Name.
You can also toggle 'Launch Ad set as Active' depending on when you want it to go live.
8. To set Budget and Dates -Click Show additional settings to:
Set a new budget
Choose a start date and add an end date if needed
9. Click Duplicate Ad Set to create and apply your new setup.