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Hi @john john
You could achieve it by:
- Go to Active sites in the SharePoint admin center, and sign in with an account that has admin permissions for your organization.
- Select the hub site that you’d like to make an association to, then select Hub settings in the command bar to open to hub settings panel.
- Next, select a hub to associate to in the Parent hub association field. Hubs that are available for association will appear here.
- To confirm which hubs have already been associated with your hub site, select View child hubs associated to this hub.
- Select Save.
For more information, you could refer to:
https://learn.microsoft.com/en-us/sharepoint/hub-to-hub-association
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