@fairymemay
As IT IS Not a sorting on Letter ASC or desc you can customized e.g with the Help of dictionary or Array Index
Define a dictionary of String, int
Add items to IT dictSort(“inter”)=0, local 1…
So with the lookup from value to Level IT can be sorted by
Yourdatatablevar.asenumerable.orderby(function(r ) dictSort(r(indexorcolname).toString.trim)).copytodatatable