Hi Arie, What I mean is just like the image below, based on the data in the list (blue circled) and check against another list for matching, and then create another list as result....

Thanks a lot, Arie. May I ask further that if Dynamo has any code to perform vlookup function of excel?

Hi Gary! I would try the node "Vector.AngleBetween". It takes two Vectors as inputs, so you'd have to create a vector from the start- and endpoint of the lines first. Good luck! Arie