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Since you already have a pdf with multiple songs loaded you can make a 'snippet'. To create a snippet display the pdf>edit [tap center of screen]> tap the left most icon [circle with a down pointing triangle], make appropriate entries and save. You still need to enter the title and the range of pages of the selection. You can select just the songs you want/need, They will show up in the main library as separate entries [as if loaded individually]. I use the 'albums tab for multi-page pdfs [books]. There is no need to break the big pdf down and no csv. It's just a continuation of the original work flow.

Edit; Just watch the upper right screen on the big pdf to determine page range before making the snippet.