To import Reddit Ads cost data into Google Analytics, you must:
1. Have Analyst access in Reddit Ads and Editor access in GA.
2. Make sure all ad URLs use utm_source, utm_medium, and preferably utm_campaign.
3. In GA Admin, go to Data Import > Create Data Source, select Cost data, and choose Reddit.
4. Connect your Reddit Ads account, select your business and ad account.
5. Match utm_source and utm_medium values exactly.
6. Set import frequency and filters, then complete the setup.
Don’t forget to delete any overlapping manual data sets to avoid duplicates.