This is a step-by-step walkthrough of how to create a new world:
In the main menu on the left-side of the screen, click Create to open the creation sub-menu.
In the sub-menu that appears, click Build worlds. This opens the My worlds panel.
Press Create on the upper right corner of the panel to create a world.
Click Create to create a new world.
This opens the World Configuration dialog. In the Name the new world input field, enter a world name for your new project.
The Choose starting content dropdown includes your own created scene templates in addition to the Sansar default scene templates.
In the same dialog, click the Choose starting content dropdown to select from a list of scene templates.
Note: You can choose one of your existing scenes as the starting content for the new world. This uses the existing scene as a starting template and allows you to experiment with the scene without affecting any other existing scenes or worlds.
The Create button is enabled once you have a world name and a scene template selected. Click Create to make your world and add it in the My worlds panel, where you can access it at any time.