Worth knowing: dinner invitations are their own product
My Joyfullday has a separate dinner invitation product for formal dinners, and it is a genuinely different thing from a party page, with its own structure for seated events. Some hosts use it for the rehearsal dinner, particularly when the evening is a proper sit-down with printed places.
Most, though, keep the rehearsal as a small page alongside the wedding planning, because what they need from it is narrow: one address, one timing chain, one list of who is eating what. The reply form, the live guest list and reminders do that job, and the page can stay short.
Either way, keep it separate from the main wedding invitation. The rehearsal list and the wedding list are not the same set of people, and mixing their replies is how a restaurant booking ends up based on the wrong count.