Finding a number or a formula across a growing workbook is one of the most common everyday moves in any spreadsheet, and Spreadsheet works the same way Excel does.
Find
Press Cmd/Ctrl+F to open Find. It searches both the values you see and the formulas behind them, so searching for GI.TOTAL finds the formula and searching for Residential finds what is on screen. Press Enter for the next match and Shift+Enter for the previous one, starting from wherever your cursor already is. Tick All sheets to widen the search beyond the current sheet.
You can also work with dates and drag-fill, or point at cells instead of typing addresses when you build a formula.