Create an indicator to find the break points in your column. Combine the rows per breakpoints together into Groups e.g. with a Missing Value node (option next value). Then go for a Group Loop and modify you group (make the first a header (Insert Column header). And your are done
Hope this helps, but I don’t think so.
Please upload a sample file (dummy data is no problem) with the original input and expected output. This makes it a way easier to find a proper solution.