Once you've created folders on the Structures page, you have the ability to move one or more files into a folder:
Moving a Single File
Click the ellipsis (...) icon, and then select Move.
Under Select Folder, click the folder into which you want to move the structure file, and then click the Move button.
Moving Multiple Files
Click the check boxes for the files you wish to move, and then click the Move to Folder button.
Under Select Folder, click the folder into which you want to move the files, and then click the Move button.
Learn More
My Files > Structures
Creating a New Structure File Folder
Renaming a Structure File Folder
Deleting Structure File Folders