Change VDSK1 feature configuration

Hello,

Requirement is to restrict access based on Personnel Subarea+Pers. Admin(BTRTL+SACHP).

We are trying to use Org key(VDSK1) to restrict authorizations. Org key should be determined based on Personnel Subarea+Personnel Admin(BTRTL+SACHP).

So, we are trying to define the decision tree in VDSK1 feature based on Subarea but also need one 'if - else' like condition under the first node(Pers. Subarea)

i.e. config should look like below

VDSK1

     --> Personnel Subarea

               --> [Value for Pers. subarea, e.g.123]

                    --> Personnel Admin (under subarea 123)

                         --> [Value for Pers. Admin 1/return code e.g. X]    

                         --> Otherwise

                         --> [Value for Pers. Admin 2/return code e.g. Y]

     --> Otherwise

               --> Return Code e.g. Z

However, we are not sure if we can add Personnel Admin as a node under Pers. Subarea. When tried, SACHP is not available to add as a field in decision tree. Can we modify structure PME01 (from where fields are derived in VDSK1 feature) to have SACHP ?

Would appreciate any pointers on this.

Thanks