Select all the items that you want to save in the Scene View or on the Selection Tree.
Click Home tab > Select & Search panel > Save Selection
.
in the Sets window.Type a name for your selection set in the Sets window, and press ENTER.
Command entry: F2
.Open the Sets window.
Click New Folder
. The folder is added to the list.
If the item selected is a folder, then the new folder is created inside it, otherwise it is added above the selected item. You can have as many folders as you like.
Type a name for your folder, and press ENTER.
Click the set that you want to add to your new folder. Hold down the left mouse button and drag the mouse to the folder name. Release the mouse button to drop the set into the folder.