In an assembly, Choose View tab→Styles group→Color Manager.
On the Color Manager dialog box, make sure the Use Individual Part Styles box is set.
On the Color Manager dialog box, click OK.
Choose Home tab→Select group→Select.
Select the part to which you want to apply a style.
On the Select tool command bar, in the Faces Style list, select the style you want.
Tip:
You can create custom faces styles using the Styles command on the View tab.