The spreadsheet grew faster than the person maintaining it. Now every update is copy-paste, the formulas broke, and nobody trusts the numbers. I fix that once.I clean the data, rebuild the formulas so they survive new rows, automate the repetitive part, and leave you one sheet that works. Google Sheets, Excel, or both - including Apps Script or a macro where that is the right tool.Step by step:You share the sheet and tell me what it is supposed to produce.I map the current mess to the one thing it needs to do, and confirm scope.I rebuild it, test it with your real rows, and hand it over documented.Common jobs: payroll and timesheets, inventory that should update itself, lead lists from a form, a monthly report nobody wants to assemble by hand, a dedupe and format pass on a list that has been appended to for two years.