Group the worksheets by clicking the first worksheet tab,
hold down the <Shift> key, and click the last worksheet
tab. Now set up the header under File > Page Setup.
To ungroup, click any one of the worksheet tabs, or right-
click one of them and select "Ungroup".
You could record a new macro with you going into the Header/Footer dialog
for the sheet that contains the footer you want to copy
This will create a macro which, because all its sheet references are to
"currentsheet" can easily be run against all your other sheets, too.
Thus:
1. Go into sheet containing footer
2. Record a new macro
3. Click View Header/Footer
4. Click OK
5. Stop recording
6. Click on a sheet that requires the header/footer details
7. Run the macro.
8. repeat Steps 6-7 for all sheets that need modifying.