=== How can I stop a Channel moving a booking back to the original room, when I have manually made a change? ===
If this is for all bookings, then go to Go to {{#fas:cog}} (SETTINGS -> ) CHANNEL MANAGER and set 'Allow Channel Modifications' = All except room change' or you can set this per booking in the "Details" tab of the booking".
=== Can I have a different invoice for bookings from a certain channel?===