A spreadsheet is read as order imposed on a mess of details. Dream books link it to planning and control, and to life being reduced to rows and columns.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.