Excel – Using Formula Auditing to Determine What Cells are Used in Formulas (Excel 2007 & Excel 2010)
There are times you may need to know if a cell is part of a formula. If you are altering or deleting cells, you can easily cause errors throughout your worksheet. Using "Formula Auditing" you can easily determine if a cell is part of a formula. The technical terms for this are "Trace Dependants" and "Trace Precedents".