Direct/Indirect Labor GL's

We have 2 GL's set up for Worker's Compensation.  One is used for Direct labor and the other Indirect labor.  In Payroll, Setup, Fringes, WC Fringes, the Expense Acct. box has GL # 5027 in it.  This is the GL # we use for Indirect Labor.  When payroll checks are posted, the system automatically posts entries to GL 4414, the account we have set up for Direct Labor.  If 5027 is in the expense box in fringe setup, how does the system know to put direct to 4414?  This is working correctly.  I'm just asking because we are wanting to set up another branch and add GL's and I wanted to know how to get those particular WC Fringes to go to a different GL.