Need Help In Creating A Context Variable

Hi

Was wondering if anyone out there can help.......

My company works in the travel industry and one of the product we provide is the function of buying a flight and hotel together.

One of the advantages of this is that sometimes a visitor can save on a hotel if they buy the package together.

What I want to be able to track is the following:

The hotel which has the saving on it (accomodation code); the saving that they will make; the price of the package that they will pay.

I am new to implementing but have been told by a colleague that I can use a context variable.

Would anyone be able to tell me how I should write this please?

Kind Regards

Yaser