Mass Update Custom Data
To do a Mass Update on Custom Data on multiple items from the Same Case, choose more than 1 item and select Mass Update Custom Data from the Actions menu.
This will bring up the Mass Update Custom Data screen.
You may now change the Custom Data Type and select whatever Custom Data Form you would like to change/update information for.
Click the slider so that On is highlighted in blue for the fields you would like to Mass Update.
After you finish choosing your options from the Mass Update Custom Data selections, click the Overwrite existing form data? slider so that Yes is highlighted in blue and click Ok.
This will overwrite any existing form data if it is present.
Your chosen Items' Custom Form Data will now have the updated information you have specified.