If you supply a few of the SNMP OIDs, we will have a much better idea of what you are trying to achieve.
Simple leaf OIDs contain a single piece of data, other are table based and are a little more complex.
Once we have the collection setup we can take you through the alerting.
You can string together multiple conditions for multiple Row IDs. Check out the Custom Table Poller Current Status example:
For your use case, OR would be appropriate for first drop down. Note the 'plus' symbol which allows you to add additional conditions (additional Row IDs).