stephen said:
How do I create a template that allows users to only input
data in certain cells, and not modify any others?
Select the cells users may modify, run the menu command Format > Cells,
choose the Protection tab in the Format dialog, and uncheck Locked. Then run
the menu command Tools > Protection > Protect Sheet. Don't bother setting a
password. Just turning on protection will be sufficient with most users, and
it's very easy to undo passowrd protection.