Wiring multple dependent dropdowns

Ok I am at my wits end. I have a youth portfolio form that contains a dropdown for the project (category). Once this is selected there are 6 seperate subheader boxes (subcaterory1-6) that should update based on the category selected the right under each of those are items1-6 which are the outcomes they are selecting they achieved which should update from the subcategory. I have all the data for this saved in an excel file both as tab for each project (category) or a master that has all in 3 columns. I got the first set to work and update. I now have updated data and also need it to the same for subcategories2-6 and items2-6. It is a complex system but would be wonderful for our youth if they could just use one form that updated for them regardless of the project. Any help is appreciated.