I have two playlists in my YouTube library, one is called Research and the other is called Studies. Now, I need to move all the 48 videos from the Research playlist to the Studies one, so that I can have fewer playlist and declutter my library. It would be tedious job to manually move them one by one, and I also plan to do this with other playlists with hundreds of videos. In the YouTube playlist section there is no option to select multiple videos at once, in order to move them. Is there any way to render this task without tediously wasting time on moving videos manually?
YouTube's new interface named "Polymer" disables the playlist duplicating/editing functionality of another channel's playlist.
A workaround [for the time being] is to temporarily disable the new interface. To do so, navigate to the desired playlist's page [as shown in the OP's screenshot] and add either "?disable_polymer=1" or "&disable_polymer=1" onto the end of the URL.
Example: //www.youtube.com/playlist?list=PLda3VoSoc_TR7X7wfblBGiRz-bvhKpGkS&disable_polymer=1
After you enter the new page, click the three dots at the top-right corner, and add all of the videos to a new playlist. You can now go to your new playlist and edit it however you wish.