Creating a 3-Tiered Dynamic Drop-Down List within a Table

Hello Everyone,

I've been searching for an answer to an issue I can't seen to wrap my head around. It involves a 3-tiered dynamic drop down list within an entry table. The intended use for the sheet is usability for more than one person, so I need to use drop-down list functionality for each cell per table row. I've recently tried using =Unique to pull a spill list in an attempt to reference lookups, but I just don't know how to get this to work for each new row within an entry table. Because I have to keep the endusers in-mind, This needs to stay dynamic all the way around. Could someone please help?