Can I create D.Ch-specific master when using Common Distribution Channel?

Hi experts

    I'm testing my system, and I found a problem that when I'm using common distribution channel, then all material master can only be created under that common D.Ch.

    I know using Common D.Ch is to reducing the master maint's time, but what if I want to create master under D.Ch other than the common D.Ch?

or just my misunderstanding about the use of common D.Ch?

   Same issue about common Division.

Example:

I have created 3 Sales Area:

Sls Org.       D.Ch        Div

wj01              w1          w1

wj01              w2          w2

wj01              w3          w3

and I have created a common D.Ch wz, and assigned it in VOR1

Sls Org.       D.Ch         Dch-Conds           Dch-Cust/Mat

  wj01             w1                wz                          wz

  wj01             w2                wz                          wz

  wj01             w3                wz                          wz

then when I create mat master, I can only select wj01+wz when selecting sales org+Dch.

how can I select other s.org+Dch combination when some mat should not be created in the common Dch?