You can create tiers in your Community in the following steps:
1. Click on the Commerce tab on the left side bar.
2. Click on Community.
3. Click on the Community you want to add tiers to.
4. To create a new tier, click on the Tier card.
5. Populate the dialog box that pops up with name and cover image.
6. Add more details to the tier with the Details tab.
7. Add more courses or re-arrange in the courses tab.
8. Designate the tier to a space with the Space(s) tab.
9. Create pricing plan(s) with the Pricing plan tab.
10. Watch the video below for more.