You can create text on the surface of the 3D model in Siemens NX. Also, you can create new surfaces inside the text, change its color or create a boss/feature
In NX Assembly modeling you can assign colors to component parts in the assembly. But in some conditions, the color might not be applied to an original part
You can change part/components colors in the NX assembly. But when you open the part in a working part window or insert it in another assembly file, you can