I'd like to group expenses into "fixed" (e.g. rent) vs. "variable" (e.g. restaurants) expenses in a report, i.e. probably pick a couple of "accounts" and group them somehow as "fixed" or "variable" respectively.
It seems complicated: https://wiki.gnucash.org/wiki/Custom_Reports#Custom_Reports_in_GnuCash
So maybe it would be easier to export and group account (summaries) in a spreadsheet, rather than trying to get it done within Gnucash?
Open to any suggestions / ideas / solutions.