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The Project creator and users with full permissions can Delete delete a project, which moves it to the Recycle Bin. From the Recycle Bin, Org admins can restore or permanently delete it.
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In Manager, select the Project from the left navigation:
In the toolbar, click +
(Create) and select the type of Asset from the context menu.
Each type of Asset has a different creation flow, the following articles describe how to create: