I have an Excel sheet for simple bookkeeping. There are about 285 entries. I have sorted it according to project name. I want to add blank rows under each project grouping, put sub-totals for that particular project, and then at the very bottom calculated the grand totals for the different categories. I did this yesterday for the 2019 sheet. Today, while doing the 2020 sheet, I sorted by project, inserted some rows at the bottom of the first project, and typed in Sum formulas for each column. Now, I scroll down to the bottom of the second project section, and attempt to insert some blank rows. I keep getting the warning that this is a large operation affecting many cells, and do I want to proceed. I closed it, restarted my computer, and reopened Excel. When it was opening, my computer said this item is 5.98 MB which is huge for a small sheet like this. I suspect there is hidden code someplace, but can't find it. What do you recommend?