gserve,
Consider the following:
408.16 Overcurrent Protection.
(A) Lighting and Appliance Branch-Circuit Panelboard Individually Protected. Each lighting and appliance branch-circuit panelboard shall be individually protected on the supply side by not more than two main circuit breakers or two sets of fuses having a combined rating not greater than that of the panelboard.
Exception No. 1: Individual protection for a lighting and appliance panelboard shall not be required if the panelboard feeder has overcurrent protection not greater than the rating of the panelboard.
I'm sure the exception will work for you. As far as the ampacity of the feeder is concerned, I can't tell you anything without knowing the rating of the branch circuits.
Hope it helps,
Doc
