Inactivating a Retirement Plan
You can prevent the use of a retirement plan by inactivating it. You can inactivate a retirement plan if no payroll item is using it.
To inactivate a retirement plan:
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              Go to Setup > Payroll > Setup Tasks > Retirement Plans. 
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              Check the Show Inactives box. 
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              Next to the retirement plan you want to inactivate, check the Inactive box. 
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              Click Submit.