Accounting for payroll deductions

I just started using Mint and was able to tag my payroll deposits as income.  I was wondering if there is a way to actually enter in my full payroll check information to capture all deductions.  It would be really helpful to be able to see Net Income, Taxes, Pre-Tax deductions (401k, health insurance etc.) and after tax deductions.  I get a discount allowing my car insurance to be taken out of my paychecks.  I am not sure how to account for that in Mint as that money is taken out before the payroll deposits into my account.