Is it possible to create a style within a style? For example, if I had a forum topic named "Gaming Lounge", "TV Lounge", and "Sports Lounge"... Can I have an overall default style and individual styles for each of those forum topics? Is this possible, does anyone have any hacks?

you can add multiple styles and also set forums to use which ever style you want.

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can you then prevent a user from choosing? My client wants to have advertisers sponsor a forum topic rather than have banner ads.

Yes thats quite easy, all you would have to do it remove the style chooser in the footer template.

I've done this for my site Music-Web. The home page, forum, articles and encyclopedia are all built within the vbulletin system but all use different styles just for tweaks to the layout.

Thank you. I will try it out.

My client still wants users to pick their style. But have some they can't pick from, but are applied to certian forums. Is this still the case? Sorry, new to this...

You can just untick the box next to the style name in the style manager to have it disabled from the style chooser box.