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.

You can hide formulas in Excel while working. All the formulas and the calculation work can be hidden from the viewers. Learn how to do it.

Microsoft Excel 2010 does not plot hidden rows or columns, so you need to hide the empty rows or columns. Strangely, in Excel 2010, unhiding the data is easier than hiding it.