Each help desk has a customer portal where your customers can submit tickets, track their existing tickets, and search your public knowledge base themselves.
The portal's branding, domain, and locale come from the help desk's General settings, so each brand's portal looks like its own product rather than a generic support page.
Self-service search plus ticket submission reduces the volume that reaches your team: customers who can find an answer in the knowledge base never open a ticket, and those who do submit arrive with the right context. Publishing good public knowledge-base articles is the single biggest lever for making the portal effective.