Hello, if there are 3D model files of handles or door panels, you can select materials to create custom uploads and use them. The operation location screenshots are as follows:

1. Enter the workbench interface, select Product Management - Category Management - Personal Categories, select the Whole House Customization option - add a good category;

2. After adding the category, enter the Material Management - Personal Materials - Whole House Customization - select the corresponding category - create materials;

3. After uploading the materials, return to the design interface, enter any custom cabinet module interface, select the material production in the toolbar position - personal library;

4. Select New, find the uploaded door panel or handle materials for editing and saving.

5. In the door panel style library, select Personal Library, find the uploaded material category, and search for and use the materials directly.

Handle model upload tutorial link:  https://www.aihouse.com/global/study/detail/715

Door panel model upload tutorial link:  https://www.aihouse.com/global/study/detail/713