how to preserve formatting across save and reopen

[GodelFishbreath]

using version:
Version: 5.1.5.2
Some of the following may be old, it was true the last time I wrote here.
Build ID: d3bf12ecb743fc0d20e0be0c58ca359301eb705f
CPU Threads: 2; OS Version: Windows 6.1; UI Render: default;
(OK Win 7 is what I think I have)
Locale: en-US (en_US)
I have a short story I am submitting to a magazine. The magazine uses this format:
http://www.shunn.net/format/story.html
Note that the first page does not have a page number or headder and the rest of the pages do. And that the first few lines are single spaced and the rest double.

I can get the document to be that way. Then I save it, close it, reopen it, and much of that is gone.
It is in the wrong format for magazine submittal

[mikekaganski]

You don’t tell which is the format you use to save your document. If that’s not LO native format (ODF), then it may happen that round-trip is not prefect, and also it may be that you need to change your formatting a little. E.g., you may specify different first page format in several different ways: you may define different header for first page in the style; or you may define different styles and define their sequence; or you may insert page break with style. They may have different support on round-trip.