We recommend using Google’s comprehensive guide on how to do this.
If you’re already bidding on UA conversions, you can replicate those conversions in your GA4 property. Doing this allows you to compare conversion volumes and then import your GA4 conversion into Google Ads.
Migrating audiences across from your UA property to GA4 lets you identify the same user groups based on your GA4 data. This can then be exported to your linked Google Ads account to address the same use cases.
You can create up to 100 audiences per GA4 property, and these audiences will automatically update everywhere rather than requiring you to select the destination.
You’ll need to manually recreate these audiences in your GA4 property to migrate them.