Portal Site Collection:
A Portal Site Collection is used to link one site collection to another site collection. Portal site will be added to the Navigate Up (global breadcrumb navigation).
PowerShell Script:
$site = Get-SPSite "https://serverName:1234/sites/Sample/"
$site.PortalName = "Sample Link";
$site.PortalUrl = "https://serverName:1236/sites/Test/" $site.Dispose()
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