Here is how this works:
Imagine you have some walls that have a comments parameter filled out with something like “This is value 1”, and you want to find them:
Notice that “rule” input is an optional input so it can be set to default by right clicking on the input itself.
If you want to select multiple groups of elements that match some values you can do that. So imagine I have two walls that have Comments set to “This is value 1”, and two more with Comments set to “This is value 2”. Here’s how to get them: