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You might also find your answer in the LastPass Enterprise Manual.
How do I move a regular folder into a Shared Folder?
To move a regular folder into a Shared Folder, you need to first create the Shared Folder using the Manage Shared Folder dialog. Then, go to the regular folder you wish to move into the Shared folder, and right click on the folder name. > Choose rename > select the Shared Folder you wish to move it to from the dropdown list. These actions need to be taken from the Local Vault, and cannot be done from the Online Vault.