windows 7 - Group Policy Management - Mass registry change

I have a number of group policy objects that I need to change all registry keys in the preferences:\windows settings: registry\hkey_local_machine\software\Microsoft\windows NT\current version\print\printers\

I need to change the properties for all keys in this folder to say "apply once and do not reapply"

I have several group policy objects that need this change and would prefer not to open the preferences for each key and make this change (will take hours and hours) Any advice on how I may be able to make a change for all keys in a folder?

Please help!

thanks,