There is good documentation of HEADER1 which I suggest you locate and read.
You cannot invent your own syntax. Read what HEADER1 can do, and you'll know what you can do with HEADER1.
Now, what do you mean by "HEADER"? There is no "HEADER" function in DFSORT. Perhaps tell us what it is you are trying to do, rather than following the route you have chosen and refusing to turn back?