Sick Leave as Leave Without Pay in Probation period

Dear Expert,

we have sick leave absence valuation.

After the completion of probationer only ,employee can apply sick leave having 90 days quota paid. working fine.

Now requirement is: employee can also apply sick leave with in probation period. But during this period,sick leave will be leave Without Pay.

So how should i go. shall i create 2 different Sick Leave type.

So Guru Please advice to solved this issue.

Regards,

Sharma