Related Records in dropdown

Hi,

After several days of trying this on my own and looking at various post. 

My file has at this time 3 dropdown's. I have "Length", "Width" and "Depth". I need at least 6 more in the future.

Each field for "Width" may have the same value 1 or more times. Depending on the Product. The same goes to the other fields.

I have 2 table set up. One for the "Data" the other for the "Product". In the relationship graft I have Data Length to Product "Length".

And the same connection fo Width and Depth. I have "List view for each field. Now with my current design. I can do a find for "Length". This seems to work ok. Now the main problem I need the "DropDown's for "Width" and "Depth" show the Related data for the "Length".

I have a file that "Phil" from "Filemaker helped me on vie his "Adventure".

Now I'm wanting to do the same via script.

Here's the Info that I'm workin with.

Any help would be appreciated.

If need I can upload my file.

Thanks

Charles