Does anyone have a way to split a bank transaction using an imported csv file or some other method when categorizing imported banking transactions? 

Every two weeks, I pay payroll.  My payroll is a large number.  My payroll processor is paid in one lump sum.  Every two weeks, I spend a ton of time splitting that transaction into direct salaries, indirect salaries, taxes, healthcare costs, etc.  I use an csv file that my payroll provider sends me that shows me what goes into the transaction.