Account Distribution on PO Lines

  Hi All, looking for some advice on a purchase order entry scenario. We use an interface to bring POs in JDE and that comes with a dummy cost code/cost type. If we want to change it to more than one account number, do we just enter an extra line, split the amount and code to different account number OR we use "Account Distribution" functionality on PO entry application? In case we use "Account Distribution" functionality, I believe a new line # isn't created in F4311, so which table stores that information? We use  Line Type J. Thank you.