Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

Excel table formulas driving you crazy? Learn the fix to lock column references, prevent errors, and simplify your spreadsheet calculations ...

On the other hand, to select non-sequential rows and columns to hide, press Ctrl as you click on the row numbers or column letters. How to Completely Hide an Excel Worksheet ...