Hi John - I would presume you would like to connect yourself to your 3-grandparents? Not a problem. You don't currently have enough of your tree entered for me to fully answer this, but I'll take a guess.
I would just go ahead and fill out the family you have up to those profiles, then make sure you have proper documentation to prove the relationship, then go ahead and add them as parents to the appropriate child.
The Family Tree you would like to share is a great find, and can be added as a photo image to any one of the profiles it covers. You can then "tag" or add additional profiles to the photo to ensure it shows up on multiple people.
Hope that helps. Let me know if you have additional questions.