Account based calculation between parent and subsidiaries

Hi,

After calculating net income for each subsidiary, i need to move "net income" to a specific P&L account in parent company. (So, moving subsidiary "net income" balance to another account of parent like "equity pickup").

Can i do this in "Account based calculations" business rule (BR)? I can't find a way in BR, where i can specify "source entity : subsidiary" and "target entity : parent".

Or, should i do this in SCRIPT LOGIC?

Another question: Once i move subsidiary net income to parent account, then, i need to calculate " parent's net income". so, how can i perform steps of "calculation of subsidiary net income", "moving subsidiary net income to parent account" then "calculation of parent net income using subsidiary net income" all at a time.

Appreciate any help.