Excel saving copies instead of changes

[SJM512]

I just started using Office 2007 on a new pc, and when I go to save a change in Excel, instead of just saving the changes Excel is saving a whole new copy. That's making for duplicates that I don't want. Where is the setting to change this "feature"?

Thanks.

[BobBridges]

I don't understand what you want, SJM. It sounds like this: You open an old workbook, make several changes in it, and hit Save. Then, to your dismay, you find that it saved the whole workbook, rather than just the parts that changed.

This doesn't make sense to me, and I suspect it doesn't to you either. What use could you have for a file that contains only the changed parts of the old workbook? You must have meant something else ... right?