How to reprice and generate billing schedule after updating the Subscription using Import Template

Summary:

What are the necessary steps to reprice and generate the billing schedule for the subscription that is updated using import template?

Content (required):

The subscription is in the Active status and I there is a scenario where the quantity needs to be updated using a spreadsheet. I have updated the quantity of the product using SubscriptionProduct import Template. But ,the price is not getting updated based on the new quantity.

Also, I have tried giving GenerateBillingSchedule and Reprice Flag as "Y" in SubscriptionProduct template, still the prices were not updated.

Version (include the version you are using, if applicable):