Hi Gonzalo,
Welcome to Atlassian Community!
It's possible to set a project to a few customers, for that you must change some settings.
Please, go to the Project settings > Customer permissions > Who can access the portal and send requests to XXXXXXX? > Customers my team adds to the project > Save.
Then, on the same page, click on "Change the Global settings" and change set the options on Customer Permissions as below:
After that, you can add manually each customer to the project.
Regards,
Angélica
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