Manage series via ONE Admin > Programme Management > Series

Here you can add new seasons using the '+ New Season' button, and edit existing seasons by going on the 'Actions' drop down.
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Under each season you have the ability to manage the episodes and manage the season videos. You can also manage the permissions to restrict on a company or individual basis. 

You are also able to manage a series when you are in the Programme Management section of the CMS. Select your programme you want to manage the series for, click 'Actions' and then 'Manage Series'.