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Using Numbers 3.6.2, and would like to save document to finish later. Where do I save it? (Saving to PDF is permanent)
You can save it anywhere you want. Just do Command-S or go to File --> Save and it will bring up a dialog box. You can use the default location or any other folder/location you want.
File --> Save
You can even save it to your iCloud account from the same dialog. See the image below.