AdWords scripts now support bulk changes to your account through uploading data in CSV format. You can upload data from a CSV file on Google Drive, a Google spreadsheet, a Microsoft Excel spreadsheet, or construct a bulk upload request in your script at runtime.

AdWords scripts currently support the following operations for bulk upload:

• Campaign management: You can create, edit or delete campaigns, ad groups, keywords and text ads using bulk upload. You can also edit existing ad group criteria, ads and product groups.
• Offline conversions: You can upload offline conversions to your account using bulk upload.

Learn more about this feature on our guide, and check out our code snippets for usage examples. If you have questions or feedback about this feature, let us know on our forum.

Anash P. Oommen, AdWords Scripts Team

Source: Google Ads Developer Blog