PAYROLL_ Long Service Accural

Hi

Was hoping someone may be able to assist.  1 Employee that was over last 10 years been casual and part-time so we have calculated their long service manually.

1. I wish to insert this balance manually into the system so it can be tracked if they use their long service.

2. I don't wish to have the system calculate long service at all I would prefer to manually do this for this employee.

3. Would appreciate any guidance that someone may have to offer how to complete the above.

Thanks

J