ON24 Auto Registration for a webinar series

We are using ON24 Auto Registration (also called seamless registration) through the form processing step "resubmit form".  We need to implement this for a webinar series, where a person registers once through our Eloqua form but is registered, behind the scenes, for a series of 10 webinars.  The "resubmit form" processing step can not be conditional so I can only use it to submit registration to one ON24 webinar.

Has anyone found a way to do this?  Perhaps through program builder?

I appreciate all ideas and comments.

Thank you,

Betty