Drag out a box around the area you wish to become a hyperlink. You can resize this box after its initial creation, so you don't need to get it right first time.
After drawing the hyperlink box, the Link Properties dialog box is displayed.
Change the Link Type to Open File.
Enter the file name in the Fileedit box or press the Browse button.
Choose if you want way you want the file to be opened with the Open In pop-up. This preference is not used by PDF Pro 2 but may be by other PDF viewers.
on the Edit toolbar.