CBSubs - OPTION to Pay Multiple Years at a Discount

I see that there is an option for "Is the first amount and period different".

However this makes the change and does not allow for an option to the end user.

Example:
I'd like to give the user the option to pay for 1 year at $100 OR pay for 3 years at $200.

If I make the change in the "Is the first amount and period different" and apply 3 years and $200, that price and validity is forced. Is there a way to give an option to the user?

Thanks.

I see that there is an option for "Is the first amount and period different".

It doesn't give them an option. It simply causes the first purchase of the plan to have a different price and duration. It allows adding a free trial to a plan or an introductory price for example.

I'd like to give the user the option to pay for 1 year at $100 OR pay for 3 years at $200.

You'll need to create 2 different plans for that.