Material is assigned to model using 'Apply Material' tool from Visualization tab.
After merging model into Master file, Material is lost.
(Before Merging into Master file)
(After Merging into Master file)
1. After creating Model, use 'Apply Part' tool from 'Change Attributes' toolbox.
2. Select nearest (suitable) Family and Part from respective dropdown.
3. Select model.
(Part and Family gets assigned)
4. After assigning Part and Family, Merge into Master file.
Material is retained in the Model.