Deductions for Domestic Partners--Standard Benefits

 I'd like to hear from other users of Standard Benefits and how they are implementing deductions for benefit options with Domestic Partner.  We are using one deduction code classified as after tax.  Is anyone giving the employee a pre-tax deduction for the employee benefit and an after tax deduction for the Domestic Partner?  And how are you doing this?  Does it flow through to Self-Service correctly?  Also is anyone capturing imputed income in Oracle and how are you doing this? 

We do not use Payroll, we use ADP.

Thanks in advance for your feedback!