Bring your existing spreadsheet history into the Profit Tracker in one go. Paste rows in, review exactly what will be added, and only commit once you're happy with it.
Name through Other Costs columns (just those
6 — skip Net Profit, Month, ROI etc, those are recalculated automatically), copy, and paste below.
A header row is fine if you leave it in, it'll be skipped automatically. Blank rows are ignored too.