I frequently use styles requiring a "flush right" setting--for example, the chapter number in a header or page number in a List of Figures. WordPerfect had a command to do just that, but Word does not (as far as I can tell). In Word, I have to insert a right-aligned tab stop and position it at the right-hand margin. That's fine, until I reformat the page with different margins--the tab stop does not "stick" to the margin setting, so it's no longer right flush. I have to manually readjust it to the new right margin location.
A similar problem exists with the page number in a header, which is centered on the page. Word intends for you to position this using a certer tab stop, but it's only centered according to the margins in effect at the time you enter the header. After that, it won't stay centered when the margins change.
Some of my documents are for foreign use, and I often have to reformat them for A4 paper vs. 8.5x11 paper, with different margin settings. I'm getting tired of adjusting all these tab stops every time I make this change. Does anyone have a better suggestion?