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I just spent most of the morning figuring out how to do this. This is what I do:

1. Select '+ New' at the top in the main library.
2. Select the folder icon on the right side.
3. Check the multisong pdf I want to use then press ok at the bottom.
4. Select 'use existing file' from the popups the 3 options. I don't remember if there was a popup on the first song. 
Note:'Rename file' didn't seem to work, probably because I used the source for other new songs.
5. Scroll to the first page of the new song using the page bar/<>.
6. Clicked on 'Page Order'.
7. Enter desired pages/order. Had to try several delimiters before I found it was commas.
8. Click on 'Fields' at the top.
9. Edit 'Title' to reflect the correct new song[/medley] name and entered the other information I use. 

The biggest problem was figuring out how to display the correct new song name in the library [steps 8-9]. 

It seems a bit involved. Can it be streamlined to where a user just:
1.Selects '+ New' at the top.
2. Selects the source file, enter the new name of the assembled new song/medley, the page numbers/order to be used, all on one popup.
3. Presses ok.
4. Taken to the editing page to complete the editing, the 'title' being the one in step 2..  

It would help, if streamlining is not feasible/not desired, to include a more detailed description of the operation in the help manual.