The daily capacity of a resource group is equal to the number of active resources in the resource group X the number of working hours in the calendar. Maybe you can play with the number of active resources vs the calendar to get your number ?
As @jgiese.wci said, crew size has no impact on scheduling, it is used for costing.
And then you will probably say that on some occasions more than one person works at the same time on the same job, so someone will suggest to look at scheduling blocks… You will try to read the documentation and run some tests… and a couple weeks later you will try to persuade management to throw Epicor in the trash and switch ERP software. Classic.
EDIT : Sorry for the rant. Here’s a post if you want my opinion on the matter: