At the top of any wedding budget worksheet you have the 6 most important categories: the wedding gown, bride's accessories, hair & make_up, groom's attire, groom's accessories and the wedding bands. These are the things that should always be budgeted first. After that, you have the following categories: the ceremony rental, the reception rental and equipment, celebrant's fees and flowers. Once you have budgeted money for these categories of expenses, you've got all the necessary things to get married. But of course, you have to accommodate the guests better than that.
Virtually any expense you have can be put into one of these categories. So your worksheet should have plenty of space or data entry "cells" within these major categories.