Best way to temporarily shut down phone lines?

Hi there! We're new to Zendesk and are in the process of rolling out Zendesk Enterprise to our team. I'm trying to figure out the most efficient way to temporarily turn off our phone lines for a specific period of time. The scenario is our sales teams have a sales meeting every few weeks that occurs during the first part of our normal business hours. Is the best way to handle this to create a separate business hours schedule and then go in line by line and select that schedule until the meeting ends and then go back to our normal business hours schedule? Is there an easier way by chance?