If you're submitting a TV script and a series bible to us you'll need to combine these documents in to one PDF to be able to upload it to DevKing, our script handler.
A simple Google search on "how to combine PDFs" brings up a host of answers and solutions, and we have used the link below successfully to combine PDFs in the past.
https://smallpdf.com/merge-pdf
You can also visit YouTube where, again, there are a host of videos showing free ways to do this.
No particular technical skills are required, and there are multiple free solutions out there. It's a simple case of Googling/YouTubeing...