Display Order question

[Pic32]

My board has five subforum, each of which has several subforums of its own. Additionally, every one of these has its own style because each has a different graphic in its header.

When I set it up I set the display order as follows (in order to keep the sub-sub forums alphabetical):

SubForum 1: 100
SubSubForum1: 101
SubSubForum1: 102
SubSubForum1: 103
etc.
SubForum 2: 200
SubSubForum1: 201
SubSubForum1: 202
SubSubForum1: 203
etc.

And so forth. I use the same numbers in by the Forum and Style Managers.

Problem is, I now need to add a new forum and it's likely there will be more to add in the future. I also need to keep them alphabetical. With these increments of 1 I foolishly devised, there's no way to insert a forum between, say, 201 and 202.

The only solution I can think of is to add a zero to the ends of all of my forums so that it will look like this:

SubForum 1: 1000
SubSubForum1: 1010
SubSubForum1: 1020
SubSubForum1: 1030

allowing me to place 1011 between 1010 and 1020.

My questions:

1) Is there a better way to do this?
2) If not and I go ahead with my renumbering plan, how can I do this without disrupting my ongoing forum? Rememer I have to insert and renumber both styles and forums. Can I do all this without screwing up what's online now?

TIA,
Pic