Now that Microsoft Teams is generally available, I wanted to provide a video demo showing how you can import an existing Plan into Teams.
Here are the steps and important items to note:
-In order to import a plan, you must create a Team from an existing O365 Group.
-To bring the plan into Teams (mirroring the plan in the Planner web app), add a Planner tab to your Team, and click “Use an existing plan”
-This will import your board and enable you to have a fully synced experience between Planner and Teams.
We will continue to develop this experience, and we always welcome your feedback here and on planner.uservoice.com!
Source : techcommunity.microsoft.com
www.office.com/setup : Blogs