You can change mesh thickness without having to modify the part in your CAD system and then re-import the part.
Use the
Offset tool to change the thickness on a Dual Domain mesh.
Alternatively:
Note: Editing the mesh thickness property should be performed when only a Fill or Fill+Pack analysis is required. The analysis accuracy will be compromised if a Cool analysis is run anywhere in the sequence.
Tip: You only need to select a single entity, then select the check box that will apply changes to all entities that share the properties of the selected entity.
Tip: Run a thickness diagnostic to check the results.