Hi Jason,
I believe you want to trigger auto notification in MII from PCo .
- You need to configure the source system for your OPC DA agent.
- For this source system you need to create a agent instance for notification.
- under this notification agent instance you need to create the notification (say notiff1).
- in the subscription tab of notification Agent instance you can browse through you OPC DA source to identify your desired TAG and subscript that.
- now in the notification (notiff1) configuration you can link this subscribed tag.
- in Trigger tab you mention the triggering conditions. and in output tab you can create the o/p expression as required for your system.
- now in the destination tab you link this notification (notiff1) to the MII transaction that you have created and map the notification to desired input of the transaction.
that's the step I just stated above, when ever the triggering expression satisfies the PCo calls MII trx .
Hope this help you 
!!!
Regards,
Kuntal