You mentioned - If the employee has been underpaid from the last paycheck using the previous rate, set up an "addition" payroll item type instead. This way, you can add the difference to the next payroll.

Any suggestion on what we would label this  "addition"? 

Would the account for tracking this expense be "Payroll Expenses" 

Would the tax tracking type be "compensation"?

Which would we choose under "Calculate based on quantity"?

And with the default rate and limit, I guess I can tailor this for each employee at the rate they were underpaid and it would be the lump amount entered here and not hours and hourly rate?

Example:  I underpaid an employee for 30 hours by 50 cents, should I enter $16.00 in this field and then change it for every employee?

I apologize but I am very new to Quickbooks and while this program does everything plus some, it confuses the heck out of me.  I'm a small business owner and recently took on enhanced payroll to save money but not sure I made the right decision.

Thanks