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The Campaign Automator is a standalone product from Optmyzr that lets you build and maintain campaigns based on a feed. It automatically updates campaigns based on the data source and can pause or enable ads based on inventory or criteria such as the level of discount. 

With Campaign Automator you can automate the creation of as many inventory-based campaigns as possible. 

There are many benefits that come with using this tool. You can:

If there are any existing ad groups, keywords, or ads that the tool created and they no longer match the template or the inventory conditions, the tool will pause them. Entities (keywords, ads, ad groups, and campaigns) that are created outside the Campaign Automator will not be touched by the tool.

For example, if a product is in stock and one of the keyword templates is changed from "{category} buy today" to [{category} buy], the tool will pause all keywords that were created with the template "{category} buy today" and create new ones with the keyword template [{category} buy]. 

The tool pulls the linked data feed right before running and so uses the version of the feed that is available at that time.

Yes, you can safely manage bids and budgets manually or use another tool like the Rule Engine from Optmyzr. 

Campaign Automator only sets bids for new things it creates. Bid adjustments are not changed by this tool.

Settings of existing campaigns will not be changed by Campaign Automator so it's safe to manage budgets manually, with a script, or with another tool.