Set Basis of Design Scenario
After comparing scenarios, you can choose the one that best suits your desired emissions scenario and set it as your "Basis of Design".
Set a scenario as your Basis of Design by clicking the 3-dot menu to the right of the scenario name in the left-hand panel.

3-dot menu to the right of the scenario name.
Within the menu, click Set as Basis of Design. Each project phase has its own Basis of Design.

Set Basis of Design scenario.
The Basis of Design scenario also becomes your reference scenario when comparing different projects within your portfolio and for AIA DDx Reporting.