an add page redirects to other page holding some parameters

I have two models person and subordinate and I have the relationship  person has many subordinate what I want to do is that when I add the person when I click the submit button I will be redirected to add subordinate to that exact person I don't want a combox to choose between people ??

How could I do that ? and more specifically how could I hold the person Id and save it in the foreign key of subordinate ??

 I hope you understand what I mean

thank you all

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