OK I am still learning. You are right about the year_variety table each is unique to the previous table. As for the duplicate numbers or extra columns I thought originally that I had to have an autogenerated key and then I need room between category numbers for future categories to fit in the sequence without having to renumber the whole table to accomodate a new entry. Even though there is duplicate or extra information hopefully this will help you understand what I am trying to do.

Thanks.