I have a parameter value within an electrical circuit i wish to apply to each element that is connected to that circuit. How do I set a parameter from a list to each element is the corresponding subsist?
The amount of circuits is ever growing so creating a separate set parameter node for each circuit isn’t an option.
Below is an idea of what the lists look like.
This can be done using @Level in Element.SetParameterByName node. Its very likely that i dont quite understand your problem (could use more explanation 
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Example: Elements at Level 2, Parameter name and parameter value at Level 1.
Looks like you might need an update @Peter_Jenkins. As @Jan_Secnik mentioned list levels make short work of this, but you don’t appear to have that feature, which would mean you’re using a Dynamo version older then 1.2.
Short of an update and list levels, you could try using a List.Map function.