We use custom properties extensively. In this case, I need to be able to indicate what email addresses need to get sent alert info for the different transaction monitors.
Creating a separate alert per team to be emailed is no good
If you have WPM 2.2 you can use macro in email alert action in "To" field. Macro has to look like this: ${N=SwisEntity;M=CustomProperties.YOUR_PROPERTY_NAME}
So for example ${N=SwisEntity;M=CustomProperties.AlertEmailAddress}
excellent, I will be upgrading soon.