I have a single user license for photoshop lightroom 6. Now as i am starting a small company, i wish to upgrade my license from single user to multi user (probably 4). Is there a possibility to upgrade ? or should i be buying new single licenses (4) ?
You Should contact Adobe Corporate Sales to see what the options are.
You might be better off going with the subscription system (In fact I think you would have to). Again this is something only Adobe Sales could tell you.
This is a User to User forum.
Adobe offers Creative Cloud for teams, either as a single app or a package of all apps. Subscriptions are per-user. Or you can purchase individual perpetual licenses as preferred.