View the path to the model file through the editor and find it in data/data.pak. Copy it under a new name to the desired directory of your mod, for example, /Test/Model.xdb.
Open this file with Notepad and view the paths to the materials. Copy these files from data.pak to the same directory as the model, so they are located nearby. That's it. In the editor, select the NEW model (specify the path), in the model properties, select the NEW materials, and in them, create new textures.