Yes, you may purchase a new plan within the free trial period. Upon purchase, the subscription will then start and be activated.
To purchase a new plan during the free trial period, go to Subscriptions.
In the SUBSCRIPTIONS page, look for the company within the subscription you would like to purchase plan and click on Purchase.
A Plan Purchase tab would open up for users to select whether they would like to Purchase Current Plan & Proceed to Payment or Plan Selection to edit the plan.
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