How do I put different materials on parts of a wall face?

This post is regarding one particular query, you can see the full list by clicking here.

Let's say you want to show half of the same wall white and half black, or maybe just a diagonal black stripe on a white wall? Being able to change portions of an elements material is essential to produce accurate elevations.

Firstly, filled regions should be avoided. They may cover important geometry and will not update with your model changes.

The Paint tool (available under the Geometry section of the Modify tab in the Ribbon) allows you to assign a material to a single face of a wall or slab. Simply click on the paint tool, select the desired material and then select the face you would like to apply it to.

What if you want to change the material of only a portion of a face? Then you can use the Split Face tool (Modify>Geometry>Split Face). Click this and then select the face you want to subdivide. You will be shown an orange outline of that face. Use Revit's sketch tools to draw lines where you want the face to be split. Lines must run from one orange boundary to another or be a closed loop entirely within the orange boundary.