One approach is to enter them all under Dental Insurance, with a footnote explaining that the number includes the other payroll deductions.
Another approach is to enter them as write-in items where you enter living expenses.
When you do, you can specify the tax category as either “FSA, Flex, Caf, etc.” or “Payroll Dedn – Not FSA.”
If the deduction is a Flexible Spending Account or Cafeteria Plan, you would choose the former.
If the deduction is a payroll deduction, but not a Flexible Spending Account or Cafeteria Plan, you would choose the latter.
The choice you make here has a slight impact on taxes.
The Flexible Spending Account is deductible both for income tax and FICA purposes.
The Payroll Deduction — Not FSA is deductible for income tax purposes, but not for FICA purposes.