How can I manage multiple business units using HubSpot?

Thanks that seems to be the direction we are going in. If I understand correctly, we should leave HUBSPOT LIFECYCLE STAGE as a general one and each business unit should have a custom LC stage field, correct?

Ill try the different pipeline idea, we are currently using salesforce, so I am not sure if I can use other pipelines…

How would you manage unsubscribes per business units? HubSpot only allows one unsubscribe page.