Folder Security

Hi All,

I have a group of home directories of around 100, that i would like to be able to apply so new security to.

At the moment these 100 home directories have the group that the users belong to with full rights and administrators with full rights.

I want to add %username% for all the home directories with full rights.

Is there any way you can make multiple security changes such as this.

AND

I would like to be able to remove or add a security group to a group of home directories.

I have tried selecting the group of folders and clicking properties>security tab, but it resets all permissions.

Is there any way to keep existing permissions and add a new group to all home directories or remove a group.

Thankyou