AdWords Editor 12.2

It's a free application for managing large AdWords accounts.
Once you’ve downloaded AdWords Editor and one or more of your accounts, you can keep working even when you’re offline. With bulk editing tools, you can quickly make changes to all of your accounts. Across groups and campaigns, you can search and replace text, copy and move items, and undo and redo multiple changes. And you’re able to view statistics for all campaigns or specific subsets.

You can make all changes in draft before uploading them to your account, and then export and import files to share proposals or make additional changes.