Now we needs to assign for products the distributors that sell it.
We proceed to create table and form for the Distributors, next create table ProductsDistributors, to end define subtable for the products table.
In the video example i have already created form and table for the Distributors .
Thanks to the subtables we can create a tree of tables considering them as an only entity. The data of each subtables will be stored in the database only when we save the root table.