You can export table data from Dream weaver into a data file that you can then open in Excel, where you can format it, sort it, perform calculations, and so on. If you're given a data table in HTML format that needs some work, you can export it into Excel, work your magic, and then re-import the data into Dreamweaver.
Before you begin, you need to have a page containing a table with data in it open in Dreamweaver's Document window.