In order to better organize your Library, you can create folders and sub-folders. Up to you to decide how you want to arrange them, either by client, topic, user etc.
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Select the Create new > Create a folder option in the upper right
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Go inside any folder, and from there you can create a sub-folder (note: there is no limit to the amount of sub-folders you can create)

You have two options, you can simply drag and drop the draft into the folder to move it or, select it via the checkbox, and select the Move option on the top nav.

From there, you can select the folder or sub/folder you want to move the Draft to
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