I have found no extension of chained or linked combos, so I decided to create one.
An extension of the combo class which provides to chain and link combos in a form
Code and example how to use the extension are at the link below:
I attached an example, which is not the last version of the combochain code, since I did some modifications to work on local store for you to check it how it works. For the last code of the comboChain check github link.
Hope It helps.
I'm opened to hear improvements