Hi I have my grandfather's Portuguese's document called the BILET does that help in the process in getting the portuguese nationality.

I am not sure what a BILET is. Would you please explain a little more about it? Did a search for BILET Portuguese, didn't come up with anything. Would help to have more information. Sorry.

Perhaps someone else will have a better answer based upon the information that has been given.

It is something like a passport?

Billet means ticket in french... I assume it's some kind of pass card.

If it is that kind of thing then it may well help you.

I think you are talking about “Billete de Identidade”. This is the most common form of identification in Portuguese territory. Any portuguese citizen MUST have one. You can be identified by a portuguese passport, but cannot have one if you do not have a “Bilhete de Identidade”. To get one, you need to have your birth certificate and some other documents that I cannot remember. Any Portuguese Consulate or Embassy can give you that information.
Hope I could help.
Lucia