How to Replace a Mesh
There is an option in Cascadeur to import any custom mesh to the scene if the skeleton bones match. This way you can replace current mesh.
- Open a character with the same skeleton in Cascadeur
- Switch to Mesh Mode
- Select the mesh and hide it by clicking on Invisible in the Objects properties menu
- Switch to Joint Mode
- Select the bones
- Click on File → Import → Add model to selected
- Choose an FBX file with a new mesh
There should be a new mesh on the scene now.
If you import several meshes like this, you can easily switch between them by hiding the unneeded ones with the Invisible button