Hi
If you mean that you'll be using the Serial monitor (as it appears your code does) then this is not possible. Serial is a simple stream of data with no ability to relocate the cursor to specific locations on the display to overwrite just the headers, nor to freeze a portion for headings.
Since you already have a PC connected to your Arduino it will be possible to do this with a process running on that PC using the stream of data as it comes down the Serial (ie USB) line. If you don't have a favourite PC programming environment, Processing is likely as good a place as any to start. It's the language that inspired the Arduino environment so it should be halfway familiar. There's a stack of helpful information at http://processing.org/ too.
All the best, Geoff