You can create spaces within 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 a space to.
4. To create a new space click on the Space card.
5. Populate the dialog box that pops up with name and cover image.
6. Click the + sign to create a post.
7. You can invite members to a space by clicking on the icon on the top right beside the create space button.
8. Watch the video below for more.