changes to excel worksheet that is paged

[carole]

Is there a way that I can make changes to an excel worksheet that is
paged into 12 months by changing one month and having changes follow
through to the others?

 

[Ardus Petus]

If you mean an Excel workbook with 12 worksheets:

Click 1st month's tab.
Keep Shift depressed
Click last month's tab

Now, your worksheets are grouped.
Everything you type in one worksheet is automatically copied to the 11
others.

HTH