Change Quantity
Modify the quantity associated with a customer's subscription plan.
Changing the quantity refers to modifying the number of items, users, or services included in the customer's subscription plan.
Click on Change Quantity button
Update Information on the screen as appropriate for your product and plan.
Select Effective From drop down
Click Check Out
Review pricing summary and apply coupon if necessary
Click Next
Review Summary
Click Done
Now the new Quantity will be reflected in the subscription.