New Consolidation Group with existing unit

Hi,
Below is the hierarcy structure of Consolidation Units where Unit A is topmost Parent Company.
CG01
  -Unit A
  -Unit B
  -Unit C
  -CG02  
    -Unit X
    -Unit Y
We want to add one new group which should contain only Unit A & Unit B during the financial year say07/2008 and it should like like as follows:
CG01
  -Unit C
   -CG09
    -Unit A
    -Unit B
   -CG02  
     -Unit X
     -Unit Y
Following steps, I have taken:
1-Created New group in 07/2008
2-Assigend Unit A and B in CG09 in period 07/2008 as 07/2008 their first period of consolidation
3-In CG01, changed the master data for Unit A and Unit B to indicate last period of consolidation as 07/2008
I would need your help:
-Is this correct way of creating new group with the existing unit?
-Do I need to remove the Unit A & B from the old group CG01 and if yes then in which period?
-Any other suggestion in the context?
Thanks,
UR

Thanks Dan,
It works fine with the above suggestion. In period 07/2008 group change task post Divestiture entry in old group and acquisition entry in new group.
However, before arriving at the above solution, we tested with one unit by removing it from the old Group hierarchy in 07/2008. Now even after I put this back in the old hiearchy and make all the above changes (divestiture seeting in 07/2008 in old group and FC in 07/2008 in new group) the Group changes task in not posting any divestiture entries. At the same time, it is posting acquisition entry for this unit.
Can you please suggest some way out?
Best Regards,
UR

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