Emmett - 8:37 am on Oct 2, 2010 (gmt 0)
I use Dreamweaver CS5 but it looks like it's pretty similar on CS4. In the files panel (where all your site files are listed) there is a synchronize button.. When you click that it will ask you if you want to sync selected files only or the entire site and you also need to choose if you're syncing to the server or from the server. When you hit preview you can choose to de-select what you don't want to be uploaded.