Linking Contents of Worksheets

[Cindi]

This is no doubt a very simple thing but I cannot remember how to do
it nor can I find it in Help.

I created a spreadsheet, then made a copy of it. In one worksheet
it's sorted by a date; in the other it's sorted by names.

If I make a change to the first worksheet, I want the related cell(s)
in the second worksheet to automatically be changed as well, so that I
don't have to make the changes manually on both sheets. How do I do
this?

Thanks!
Cindi