How do I add additional products?

I am using the SaaS template and have the 'out of the box' subscription product working.
I want to add an additional product option (like the one that exists on the PricingPage.tsx).

Here is where my lack of recent dev experience shows.
It appears like I would need to pass a var into the stripePayment() call on the PricingPage.tsx noting which button was clicked. And then update Server\Actions.ts to accept that var and update line_items as well as mode in the checkout session based on the details of that var.

Is that the best way to approach this? Or is there a simpler path that I am not seeing?
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