Launch the Modified Geometry

Click Add/Update Design from the Setup tab:

On the Add Geometry File dialog, browse to your examples folder, and select Manifold-design2

In the Designs list, click on design you just created.

Click the Update selected design button.

In the Design Study bar, verify that the units listed on the Geometry branch are mm. Correct if necessary.

Launch into Autodesk Simulation CFD using the appropriate tool button or menu item.

On the Design Study Manager, click the new design in your design study:

Click the Update design button.

The geometry for the second design is updated. The middle outlet should be missing:

In the Design Study bar, verify that the units listed on the Geometry branch are mm. Correct if necessary.

For more about the Design Study Manager