Save info from dropdown list in related tables

I have 3 tables related(Printers, Items, Aux).
For printers I want to save items via aux.
When I add an item in aux I open a dropdown list to select an item and memorize it.
Printers have one aux. Aux has more items.
I have difficulties when I select an item from dropdown list. I don’t know how to save it.
Please help.

See this post: Save related models

Note there are other links in that post that may also help.

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