Easiest way to pass variables between modelforms (genericforms)

I am using create_update.create_object to handle my forms (generic
forms both use modelforms). I have two forms. The second relies on the
pk of the first as a fk. I can't figure out what is the best practice
to A: save the pk as a variable or into the session, then B: pull that
variable either out of the session or another place, such as a global
variable.

I could write the forms manually, but this does not seem to be the
most efficient way, unless create_object was meant for very simple
forms. I have tried using extra_context to call another function, but
I dont know if that is the best way either.

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