Help with combining sheets in excel to create 1 pdf document

I'm using the pdfcreator 1.1.0 version. I need to combined 3 sheet from Excel to create 1 pdf. Total number of pages are 16.

I have set print areas in each sheet but when I activate the print to pdfcreator I get the 1st and 2nd sheet as 1 document and the 3rd sheet as another document.

What am I doing wrong? Your advice and assistance is appreciated.