Scott is correct. If you are trying add effects to the output of Dim Pro, they will apply to the entire aggregate of however many elements you have used for that Dim Pro instance. There is likely a means of adding some Dim-Pro internal effects to each element, but I do not know what effects it may come with, and I never use multiple elements within any instance of Dim Pro.
So, my approach to this is that I always just insert a new instance of Dim Pro for any additional Dim Pro sounds I want to have for my project. I sometimes have up to 9 or 10 instances of Dim Pro, depending on the project. I have oodles of memory so it is just not an issue for me to have multiple Dim Pro instances. This approach is easier for my brain, and also it opens up the full compliment of effects that I have in Sonar, instead of only being to use whatever internal effects may come with Dim Pro, as would be the case if trying to apply effects to any of the individual elements.
Bob Bone