How to create new Registry Key under HKCU using Custom ADM GPO

I am trying to create subkey called BrowseNewProcess Inside BrowseNewProcess Key under hkcu\software\microsoft\windows\currentversion\explorer. I have to set reg value BroseNewProcess to "no" but i have to do that using Local GPO. However i want to know if it is possible to us custom adm file for carrying out the same task. I am not sure if it is possible or not but if it is than i will like to know how, help regarding this will be highly appreciated.

You just have to create a custom adm and you will be able to create new registry while setting the policy

CLASS USER
CATEGORY "Blaaah"
POLICY "Seperate Process"
KEYNAME "Software\Microsoft\Windows\CurrentVersion\Explorer"
VALUENAME "BrowseNewProcess"
VALUEON "yes" VALUEOFF "no"
END POLICY
END CATEGORY

In case you have any queries further you can feel free to ask.