Do you mean for all new workbooks created?

Yes........create a template with the footer and use that template as the basis
for all new workbooks.

Open a new workbook.  Customize as you wish.  To set a footer for each sheet,
select a sheet then right-click and "select all sheets".

Enter your footer on the active sheet and will be done to all.  Ungroup sheets
when done.

File>Save As Type:  scroll down to Excel Template(*.XLT) and select.  Name your
workbook "BOOK"(no quotes). Excel will add the .XLT to save as BOOK.XLT.

Store this workbook in the XLSTART folder usually located at........

C:\Documents and Settings\username\Application Data\Microsoft\Excel\XLSTART

This will be the default workbook for File>New or the Toolbar button File>New or
CTRL + n

WARNING................Do not use File>New...Blank Workbook or you will get the
Excel default workbook.

NOTE:  Existing workbooks are not affected by these settings.

You can also open a new workbook and delete all but one sheet.  Customize as
you wish then save this as SHEET.XLT in XLSTART folder also.  It now becomes
the default Insert>Sheet.

More can be found on this in Help under "templates"(no quotes).

Gord Dibben   Excel MVP