So there are a couple of different scenarios here, and the answers would vary based upon the precise behavior being looked for.
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Multiple separate models with multiple submit buttons - each submit button submitting their own form and the other forms are ignored.
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Multiple separate models that are related, and one submit button saves all.
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Multiple separate models that aren’t related, and one submit button saves all.
What I have done in the past for #2 is to use the formset facility with the formset having a limit of 1 form, and not providing any facility to add forms.
Ken