Can all schedules on a PO with many lines be firmed in mass?

For various reasons, there are some POs that will need to be imported into Oracle rather than be released from planning. Some of these POs could easily be 100+ lines. We have found the most efficient way to create the POs is to utilize the VB add-in. However, we would like these POs to be Firmed so that Planning does not recommend rescheduling. It appears there is no way to firm the schedules via the VB template. Is there any way for us to mass update all schedules on a PO to firm them in another way? Due to the