Locate the existing booking that has already been created.
Along the Room & Rate section on the Main tab within the reservation - you will see the Use Room Block button.
Click Use Room Block
This will display the room block search screen.
Select your search criteria and the results matching your search criteria will be displayed
Select ‘Use’ to attach the booking to the block
Once successfully added the ‘Add to Block’ button will be replaced by ‘Remove from Room Block’