Payroll set up with child support garnishment etc. in Quickbooks

Are they named the same or is there a 1 or some other variation for the extra account.
You cannot merge payroll items, the only thing that you can do is to make sure you have all employees using the same payroll item, Do a payroll adjustment to move any balances over to the proper payroll item and then make the extra account inactive.
This will take you to one and let you run set up

QuickBooks will set up both sides of a simple plan if you use the EZ set up.
OPen the payroll item list, click on Payroll item (at the bottom of the window) and then new item. Chose the EZ set up and it will walk you right through it. You can then go in and edit each item (employee and company) as you need to.

PS Please rate my answer as I am attempting to become a premium expert.

Thank you

Did you set up the simple plan through the ez set up? QuickBooks will automatically default to the USUAL settings -ie employee portion is only taxable at the state and local level)
You might want to check how you have it set up. To do this
Go into the edit payroll item, click through until you find the screen for Taxes and select the items that are affected by the contribution (check with your state and local taxing authorities to see if you need to withhold for the employee portion)