Drill up to node juste before

hello again,

I would like to know if it's possible to drill up to the node just before.

Let's say i have this structure:

-Company 1

      +departement 1

      +departement 2

      +departement 3

and i drill down to departement 2 and get

-departement 2

      + 1

      +2

      +3

and  drill down again to 2 :

- 2

     A

     B

     C

i would like to be abble to select -2 and drill up and  go back to -departement 2 and not -Company 1

here is the code i have right now,

'CMD_1=CMD%3DDRILL_TO_LEVEL%26LEVEL%3D'&NSTR(#ID[ACD8CJ]@Cost_Element_key,'B')&'%26IOBJNM%3D0COSTCENTER%26DATA_PROVIDER%3DDP;'

i can't figure out what to changeto make it work the way i want.

Thank you very much

best regards