Every test case created with TAST needs to be stored under a Domain/Project/Folder/TestCase structure. In order to work this structure, the user can create (if allowed by user permissions) as much domains and projects as needed. The process to do that is quite simple:

1. Click on Customize → Domains and Projects

2. In case a new domain is needed, click on new domain button and fill the name of the new Domain. Then click on the disk (save) button

3. Click on the domain which will contain the new project, it will be marked in dark red