Reschedule of period closing

Hi SAP Gurus,

In our implementation project, we have done client copy in which fiscal varient defined as April - March .Also we opened period 10 that is January in system.

Then as per client requirement we have changed fiscal year varient V3 to V6 that July - June in the system.But according to this new fiscal virent 10 th period means March. For that we have to select the period of March -April to post the document.

How can I reschedule the period closing.

Please suggest me detail procedure for above.

Thanks in advance

Mahesh