I’m confused

Default field values and custom business rules

I have a page containing two controllers that have a master/child relationship.
When i create a new record for the child controller i need to get the value of the selected master record and then do calculations/retrievals from the DB so that when the createForm1 shows some of the fields have default values.
I have created a custom business class where i do the calculations but i do not know how to pass the value of the selected master grid through to the
Protected Sub PrepareNewPayoutRow()
If i try pass a parameter like Protected Sub PrepareNewPayoutRow(byval xxx as string) i get a runtime error.
Any ideas how i can do this?
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