Your solution is very cumbersome. 

Each line item I have on invoices are unique but I need to input a particular item designation so the system know where to post the two sided entry.  Debit goes to accounts receivables and the credit goes to what ever is designated in the item.  In my case an income account.    If I add the time/costs to fill in what needs to be billed, then go back in and input an item, the description gets deleted.  How can this deletion be overridden?