PO approval hierarchy - cross business group requesters/approvers - any guidance

hi,

We are implementing our first countries since moving to HR has been fully installed; and due to potential future HR implementations - need 2 business groups (one for sweden and one for DK) rather than one for nordics for HR legalistive purposes.

however, we want to have an PO approval hierarchy based on position rather than employee/supervisor where requesters and/or approvers can be across business groups.

is it possible to do :

1) easily

2) without duplicate employee and/or fnd_user account records.

any help would be much appreciated.

thanks in advance,

regards,

Jill