reusable |IMG objects and Config units in solution manager

Hello,

On solution manager, I have assigned LCG assignment to IMG objects and Config units, these are reusable to other project, I copied the folder ,IMG objects and Config units, I can change different LCG at folder level but not IMG objects and Config units, is this some permission issues or , or it is not at all possible on the SolMan to change to IMg object and config unit ? Earliest reply is appreciated.