The Edit tabis used to edit existing files: most functions are activated as soon as your cursor is located in a corresponding field.
Add line
Insert line
Delete line
Copy line or
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The command to copy lines is especially useful when copying entire datasets in the basic data module.
Items in the Edit tab
The entry Copy line located in the Edit tab does NOT apply to files. The tab used to edit individual files is the File tab with its commands New and Open, including Copy.