My challenge is that I have multiple contacts from the same company. I can see in SwipeOne where the website domain can essentially be the company (or you can just add a property for company name). But there is no central company record with company tags.

How do you overcome this? If there were an automation action that could "clone" certain fields/tags from perhaps the oldest creation date of someone with the same website domain, maybe that would work as well.

I just see a lot of manual effort trying to mentally detect contacts coming in via API that are from an existing company and populating a common set of fields so they are in their rights segments/filters.