To import a work-unit inside a project:
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Close all Wwise projects
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Copy the wwu files from one project to another, in the correct sub-directory.
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Re-open the project for which you imported the wwu file(s)
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Review the load messages in the load log.
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Save the project if the load log is correct
Reviewing the load log is especially important to ensure that everything was expected during the import process.
Wwise will handle most of the missing elements or conflicts, such as ShortID or name clashes gracefully, but it may have to rename or change the ID of existing objects in your project, forcing you to regenerate all associated SoundBanks.
Always make backups or use source control before importing foreign work units, and again, make sure to pay attention to what the project load log tells you!