Hi there!
I may be misunderstanding what you want to do as I have never used FrontPage just Dreamweaver, but here goes! I don't claim to be an expert, but I seem to manage...!
To apply a CSS sitewide, you first need to create the CSS sheet. In the top right of the palettes (right hand side of screen) on Dreamweaver, you will see a "STYLES" palette which shows the styles being used in the current document. If you right click and select "ATTACH" you can browse to the stylesheet you wish to link to - Dreamweaver inserts the code. Then to make sitewide changes via the CSS, you just need to edit that particular CSS document.
If you have created an individual page and then want to use those same styles for other pages, you can export the style to an external CSS document (using the same "right click" menu - "export"). Then you just delete the styles out of the document, and link to the exported sheet.
I hope this is what you wanted to know! Please post to let me know how you get on and whether this was useful. 
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