You can change the default only by creating a Template which would be the basis
for all New workbook/worksheets.
Here is my standard reply to creating Templates for new workbook and
insert>sheet
Open a new workbook. Customize as you wish.
Note: you can set all sheet footers at the same time by "grouping" the sheets.
Right-click on a sheet tab and "select all sheets". Set up a custom footer on
the active sheet and will be done to all. Ungroup when setup is complete.
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
Do not use File>New...Blank Workbook or you will get the Excel default workbook.
Existing workbooks are not affected by these settings and would require a macro
or grouping the sheets and make settings as above.
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).
Notes on header/footer margins.....................
Left and right header and footer margins do not follow the page margins and
cannot be changed outwards.
They are generally limited to about 3/4 inch from paper edge.
You can pad with spaces to bring them inwards.
Gord Dibben Excel MVP