Subscription: Renewal or Creation

-- url of the page with the problem -- : www.scramble.nl
-- HikaShop version -- : 5.1.1
-- Joomla version -- : 5.2.1
-- PHP version -- : 8.1
-- Browser(s) name and version -- : Edge 130.0.2849.80

I'm on the last straws of configuring Hikashop. One remaining question here. We sell subscriptions. The documentation teels me the 4 different modi. I already figured out that we need to use Renewal or Creation as a type. I have a subscription product which when bought results in a 1-year subscription. Great.
But then the renewal? Do I have to create a seperate product in the webshop for the renewal (with a product type 'Renewal') to make this work? Or is the single product with buying the subscription enough and if so, how can I make it to work? Now with every buy I create a new subscription instead of prolonging the existing one.

Jerome,

In the subscription detail I don't see the renew option, but that is most probably because I set the 'renew before expiration period' on 30 days. So the renew option will only become visible 30 days before expiration?

Greets,