You can easily duplicate an existing 1:1 and use it as the basis for a new 1:1.
First, select the 1:1 you want to duplicate from the dashboard or on the 1:1s tab. Once you're viewing the 1:1 you want to duplicate, click the more (...) button and then Copy. You can now update the 1:1 with the new details.
When you’re happy with your 1:1, click Save 1:1. Your new 1:1 will now be visible in Willow.