Ok, since you want properties on each instance, it looks like what you'd need to do is setup a DataSource using ActiveDiscovery and in the Active discovery script, you'd need to discover the attribute of each instance. Your discovery script would need to output in the following format, one line for each object:
instance5_id##instance5_name######auto.fooProperty=somevalue instance6_id##instance6_name######auto.fooProperty=thisvalue
In this case, two instances would be created, called instance5_name and instance6_name, and each would have its own property.
@Mike Moniz is right, if you want device level properties, PropertySource is the way to go.
