Unable to delete body/faces when wrapping

I want to simulate the aerodynamics of a Tesla Model S but due to faults in the geometry I resorted to wrapping the Cad-model, as suggested. Now hover, I am unable to delete the original model without deleting the wrap as well. This leads to the error “missing materials for geometry” when simulating. I have tried to use “delete faces” but it does not work.
Thank you in advance.
(I am unable to make my project public due to a professional license, the project however is puclic to support)

Hi @elioschenker, thanks for posting on the forum and welcome to the SimScale Community :handshake:

Can you post the project’s URL here?

Cheers
Igor