how to remove previously added cart link?

sivasiva Member
we have 2 subscription plans to our product...1 month and 3 months....the problem is...if i click on 1 month plan then immediately i click back button to select 3 months plan is showing 2 added links in cart that is both 1 month plan and 3 months to automatically remove previous link if i get back to select another plan....any documentation on that please?
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