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You might also find your answer in the LastPass Enterprise Manual.
How do I create Shared Folders?
To create a new shared folder, login to your online vault at www.LastPass.com and click on the ‘Manage Shared folders’ link from the ‘Actions’ menu, then click on 'Create a new shared folder'. Once you have given the folder a name, hit ‘add’. In order to assign users, click ‘edit’ next to any given folder and then select the appropriate users from the dropdown menu.