thesolarguys: I did all of the steps above but when I create a grid the field displays empty.
You've linked the tables but I'm not sure how you wanted to use this link because the data in these tables wouldn't normally relate to each other. For example, you can add a link to the Contact field inside the Customer table from the Invoice table because each invoice is linked to a customer (and each customer is unique). Linking typically requires unique, related data.
What are you trying to do so I can try to answer your question better?