I had understood your query in first thread, and the (named selection with worksheet) and (nodal force) are the only two things that you will need to filter out the nodes at the center of the section without needing to split the geometry in geometry modeler.
following video explains it for faces, you should be able to do the same for the nodes as well.
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New Post - Reply To: lateral–torsional buckling … problem with creating the right model