My company is using roaming profile for all users.
And I would like to change it to local profile due to some reason by using
registry tweak..and by using logon script , so that all user can get it.
Does anybody know what is the responsible reg key by which we can change the
type of profile from roaming to local ? or vice versa ?

it would be much appreciated to answer this..

thanks

If you want to change the profile type globally then you need to edit
the Active Directory account, the registry has nothing to do with this.

Unless there is a lot of computer swapping going on there really is no
reason why you can't change it manually *only* for those users that
need that change on a specific computer throught system properties.