If the changes you've made to the toolbars are just built-in icons
(tools|customize), you can find your *.xlb toolbar file and paste it into the
correct folder.
I like to make a minor change to a toolbar, then close excel and search for the
*.xlb file. Then I'll know for sure which *.xlb file excel wants to use.
If the changes you've made to the toolbars point at macros that you've written,
you'll have to do more work. You'll have to find those workbooks that contain
the macros and reassign (or at least verify) the macros to point to those files.
Personally, I would rebuild the toolbar with the built in icons. There's lots
of things that I don't use and many that I may want to add. It never hurts to
clean up those toolbars.
And if I'm assigning macros to the toolbars, I wouldn't do it manually. I'd do
it via code.
For additions to the worksheet menu bar, I really like the way John Walkenbach
does it in his menumaker workbook:
http://j-walk.com/ss/excel/tips/tip53.htm
Here's how I do it when I want a toolbar:
http://www.contextures.com/xlToolbar02.html
(from Debra Dalgleish's site)
In xl2007, those toolbars and menu modifications will show up under the addins.
And if you use xl2007:
If you want to learn about modifying the ribbon, you can start at Ron de Bruin's
site:
http://www.rondebruin.nl/ribbon.htm
http://www.rondebruin.nl/qat.htm -- For macros for all workbooks (saved as an
addin)
or
http://www.rondebruin.nl/2007addin.htm