SAP Posting for Control accounts

Hi ,

Our legacy systems post entries to control accounts (which are use to check either posting that has been made by purchase invoice should reflect to be recharge). Recharge means that we have to charge customer for that.

In our case we receive invoice from supplier it goes to Purchase Ledger but it also goes to control accounts of that supplier that it has to be recharge. so we charge customer for that product. Please can you define me same process in sap B1.

Thanks