How to eliminate Polylines wich elevation is superior to certain number

Hello comunity. I am new at Dynamo, in a project i need to eliminate polylines superior to an given elevation. I am trying but i get stuck

Welcome to the community! What do you mean by superior? Do you mean elevation greater than a number input by the user?

Here’s one way by geometry that seems to work.
Polyline Filter by Elevation v0.dyn (32.4 KB)

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oops I didn’t double check the list levels; I added in a list.flatten after select objects by type node
Polyline Filter by Elevation v1.dyn (34.3 KB)

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