How to Attach a User or Users to a Company

Ok, we have users and we have companies and we have different company locations. How to attach them? Or what’s the best practice in attaching a user to a structure (company/location)? Or is there another way to approach this? Thanks!

John Doe -> abc-company
Jane Smith -> abc-company
Jacky Smith -> abc-company/location-a

Robert Craft -> xyz-company
Joe Craft -> xyz-company/location-south
Jane Doe -> xyz-company/location-north