Open or create your part in SpaceClaim.

Use Additive Prep to orient your part and generate supports.

Suppress parts not intended for simulation.

Currently, the Additive Print application has a limitation in that it allows only one build part for an AM simulation. (There can be multiple bodies, but they have to be on the same part.) If you have multiple workspaces in the Build Volume, right-click and select Suppress for Physics on the workspaces you will not be importing into Additive Print for simulation.

If you plan to use a build file in Additive Print, generate the build file.

The build file will be written for whichever workspaces are not suppressed.

Export from Additive Prep. (Click the Export option from the Additive Prep ribbon.)

You will need the build file, or the part and support .stl files, later, so be sure to do an Export from Additive Prep rather than a Save As... from SpaceClaim.

Open Additive Print.

Import the build file, or the part and then the supports, as usual.

Proceed with the simulation as usual.