For content you can use HTML and template variables to include information from the booking.
To change the name of the tab enter the following in the Control Panel Custom Text setting: *Custom Tab|New Name of the Tab replacing New Name of the Tab with your preferred name.
Each sub account can have its own custom tab. If a sub account has a custom tab defined, this will be shown instead of the global custom tab.
To hide the custom tab from individual sub accounts go to ACCOUNT LIST then *click on "Manage Account" and enter
bookedit-custom
in "Hide menu pages"