Hello @RandyP684 ,
The following sign up forms type allow for multiple list options when contacts are signing up:
Legacy lead generation landing pages
Coded sign-up forms
editing an Inline form
editing a Pop-up form
editing a Flyout form
editing a Banner form
The Update Profile form, accessed via the Update Profile link you can include in your email footers
At this time the standard lead generation landing pages can only be assigned to one list at a time.
For the forms where you can have multiple lists available, while editing them you'd only select the lists that you want signees to be able to see and select when submitting their info.
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