Avoid AD assignement groups

Hi all,

I received an inherited console with groups created by importing OU from active directory. I need to migrate clients from SEP11 to this new console and I need to avoid the assignement to the AD groups and send the clients directly to the ones that are created by myself. I created an installation package exporting the policies of this group, but when I install SEP12, the clients goes directly to the OU and no to the group that I want.

Is there any chance to avoid these and send the client directly to the group that I want?

Thanks in advance