When you have one breaker used upstream of others, they all must be listed (by UL) for use in series, i.e. the let-through of the upstream breaker is lower than the withstand of the downstream ones. If they are in a panelboard and all are the same make, you should be able to get that info from the manufacturer now. If you have mixed brands within a panelboard or are using stand-alone breakers, you may have to pay a PE to do a certified coordination study on them.
