Section columns are currently not supported in RadWordsProcessing's model and in the export to PDF. Here is the respective item in our public feedback portal, where you can vote, comment, and follow to get notifications on potential status changes:
WordsProcessing: Section columns
Considering that you have permissive license, one possible workaround would be to use the document model and format providers
of RadRichTextBox for WPF (or WinForms). The model supports section columns and export to PDF, the only small downsides are that it references some WPF-related assemblies (still part of .NET Framework) and has to be run in STA thread.
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