Don't know if this helps, but I downloaded a Wedding Spreadsheet templete from Excel online. I just searched for a "wedding" in Excel, and it took me to their website so I could pick one to download for free. It's already formatted so that there are lines for all of the things you need and it totals everything for you. For awhile I was planning 2 weddings, because I wasn't sure if I could afford a Dis wedding. So, I did 2 spreadsheets, one for a home wedding and one for DIS. I took the numbers from the wishbook and compared them to what fellow Dis-ers reported, then did the math. It ended up working well, because it wasn't much more for a Disney wedding for me!
BTW- there are also templetes for invite lists, what to pack, etc. They really helped out!