To allow creating multiple PDFs, please re-design the Print to PDF dialog box to be more intuitive & self-explanatory as shown here:
Currently selecting multiple sheets to create a PDF is not straightforward.
A crude way to select multiple sheets is to: hold Ctrl key and Select (left click on) desired tabs then choose Print to PDF... this allows selected sheets PDF.
But, end users may not be aware of this & i'm sure a first-timer willing to print multiple sheets to PDF wont be able to figure this out easily.
Use ver. 10.1.3 onwards for this workaround.