In your Canvas account search in the Canvas "Commons" for "OPENSTAX" to view a listing for pre-built downloadable courses shells that have incorporated OPENSTAX titles.
Here's a screen shot of the course shell built around OPENSTAX's Biology textbook.
Some OER adopters find that their adopted OER textbook, published as a PDF, are offered as one massive PDF file. Very large PDF files can create difficulties for students when downloading, storing, or printing.
The BCC library now has Adobe Acrobat Pro installed on all of the library's PCs. Adobe Acrobat Pro is different from Adobe Acrobat 
Reader; Acrobat Pro enables editing and resizing of PDF files.
If you need assistance with cutting your OER PDF textbook into smaller files, such as splitting one large PDF file into a PDF file for each chapter, the BCC librarians for help you with this task.
Click to link to the official Adobe instructions teaching you how to "split one or more documents into multiple smaller documents."