Besides creating a new segment that meets the criteria set on the platform for export to Google Ads, you can use the segments already existing in the Google Ads account.
Go to Connect, select Google Ads and click on Audience segments.
You will access the page containing the list of segments.
Click on the button at the top right Use existing segment.
In the window that opens, select the Google Ads Account from which you want to use the segment.
The segments present on the selected Google Ads account will be suggested to you, excluding those already mapped in the platform. Click on the Use button next to the segment you wish to reuse.
The segment configuration page will open, where you will need to set the parameters described in the article Export a segment to Google Ads.
After configuring them, click on the Use button to use the segment.
You will notice that a new one will be added to the list of active segments with the name of the one you have decided to use.
To modify its properties, click on the icon .