How to clear data but not formula from a cell in numbers 3.6 for os x
I am trying to clean up a table with rows for future data. Several cells in the future calculate non-meaningful results, because they require data for a certain date. So I want the formatting, and the formula, but I don't want the cell populated with a zero (or the result of 0 less another cell). I see the delete, and the clear all but I can not find a clear data and save the formula. It would be easy in excel.
Thanks, I am trying to learn numbers but the paucity of real documentation is a challenge!
MacBook Air (13-inch, Early 2014), Mac OS X (10.7.5)