Posting period Variant..

Dear All,

For my client ealier they used one Posting period variant for all company code, based on their request we created posting period variants for each company codes because respective company heads wants to close their periods. Now my Question is they want system to close all the posting periods for the rest of the comapnies when they close the posting period of holding company.

and at the same the time the heads from the respective companies should not have the access to open the closed periods.

Please provide me the solution....