How to clear contents of a row while retaining formulas in certain cells used for the columns.

Having difficulty removing the contents(numbers) in a row but I want to retain the formulas used (established) for certain columns made on the spreadsheet to be used later for a new entry to replace the old numbers. Not all of the columns on my spreadsheet have formulas being used. When I clear contents of a the row it clears the formulas also. Want to retain formulas used.