Try either of the following:
1) Tools Protection Protect Sheet
2) Tools Protection Allow Users to Edit Ranges...

This is a great reference:
http://j-walk.com/ss/excel/faqs/protectionFAQ.htm


This is worth a look too:
http://www.techonthenet.com/excel/cells/protect.php



Regards,
Ryan--



--
RyGuy


"Wm Pincumbe" wrote:

Is there a way to lock a cell from being changed once data has been entered
into that cell?