Both
routine and
substantive editing services* are available:
Routine editing adds a little "polish" to manuscripts that have already passed an internal review.
Substantive editing is best for a rough draft, when lots of reviewer comments have to be incorporated, or when an overall rewrite is necessary to improve its readability or to make it "readable" to a different type of audience--such as making a very technical document palatable for readers of a different profession or for the general public.