Channels are an extremely useful feature that is designed to unblock content from around the world without you needing to worry about which VPN region you need to connect to. Its sole purpose is to automatically proxy data from streaming services and give you the ability to set which regions each channel (service) will stream from.
Goal: To view streaming service "A" from USA on tablet but view it from UK on computer.
How to: Create a new profile and call it 'tablet'. Go into 'tablet' settings and set streaming service "A" to USA. Login with the username yourUsername-tablet on your tablet's VPN client.
Create a new profile and call it 'computer'. Go into 'computer' settings and set streaming service "A" to UK. Login with the username yourUsername-computer on your computer's VPN client.
This will now display different content on streaming service "A" depending on which login you use.
Notes: You can mix and match as much as you like, as well as set different regions for different channel groups.