Meta Business Help Centre
How to use a saved audience

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You have to save an audience before you can use it for another ad set. To do this, create the audience and click the Save this audience button at the bottom of the Audience section of ad set creation.
When you save an audience, everything about it is preserved for future use except its locations. You have to select your locations each time. If you use many locations, try bulk uploading to make this process easier.
To use a saved audience for a new ad set, click Use a saved audience at the top of the Audience section of ad set creation and select the one that you want to use from the drop-down.
Note: If you want to tweak the audience slightly for your new ad set, click the Edit button that appears to make changes. You can also access and edit your saved audiences on your Audiences page.

Note: You can't create new ad sets with audiences based on Facebook Pages that have been deleted, and you can't use those audiences in other campaigns. This includes engagement custom audiences, associated lookalike Audiences, special ad audiences or saved audiences that include an engagement custom audience.
Learn how to review or update expiring audiences.