Assigning Materials to a Model in Part Mode
You cannot assign a material to a model in assembly mode. Keep in mind the following points as you assign materials to a model:
• If a model does not contain any material, the first material that you add to the model is assigned to the model.
• You can assign only one material to a model at a time even if a model has multiple materials.
• To remove the assignment of a material from the model, select the assigned material from the Materials in Model list and click File > Unassign.