If you have added your own score to SmartMusic from a MIDI or MusicXML file, you have the option to assign your Book during or after the upload process. To assign a Book after the upload process:
Select the Uploaded content tile.
Or, select See all in the My Recently Uploaded Content deck.
Find your Book (you can use filters) and select the title to expand the Book's details. Select Assign to choose a Movement from the Book.
The Let's Set Up Your Assignment page appears. Follow the instructions in the Assignment creation article to finish the process.