"B" fields

Can someone answer these questions?:

1)When a category in a race fills (i.e. Master 45+) and the promoter adds an additional field (Master 45+ B) how are the BAT/BAR points calculated?

2)When a category in a race fills (i.e. Master 45+) and the promoter adds an additional field (Master 45+ B) how are the upgrade points calculated?

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