The deductions that are used for the Means Test are coming from the Schedule I pay advice.
If your district requires the 6- month average from all pay advices for these deductions, you should select that box when editing the pay advices.
If you would like to override any of these deductions, you may do so in the Means Test Questions tab. When you select "Yes" next to "Override expenses from Schedules I & J?" a modal will appear that allows you to override. This will ONLY override the means test and will not affect anything else in your case.