Click on the Define 3D Model button in the Target model dialog box, the 3D Geometry dialog box will be displayed.
Choose the selection mode in the Type field. You can choose the following options:
Solid - to select only solid objects;
Surfaces - to select surfaces only;
Both - to select both surfaces and solids.
The default option is Both.
Select the solid body.
The selected entities will be highlighted and the selected entity name will be displayed. In case you have chosen wrong entities, use the Unselect option to undo your selection. You can also right-click on the entity name (the object will be highlighted) and choose the Unselect option from the menu. Confirm your selection by clicking on the Finish button.
Confirm the selected solid bodies with the Finish button.