Texture mapping currently can only be applied by object, not by style and not to each component of a style individually. That means that each object component (for example a wall layer) will take the texture mapping assigned to the whole object.
Texture mapping on a VisualARQ object
To apply the texture mapping to a VisualARQ object just select it (for example a wall) and from the properties panel, under Texture Mapping apply it like you would do with any Rhino geometry.
How to apply a different texture mapping to a component
Since applying a texture mapping by component is not supported yet, to achieve that we recommend using a material with a WCS (world coordinate system) mapping. This way the material will have its own texture mapping and will not get affected by the one applied to the whole object if it had any.
The WCS mapping option can be set from the material texture settings, the WCS (box style) will be usually the right choice. There you will be able to set the global values for offset, size, and rotation for the texture.
Using materials with WCS is also a good option to avoid having to set a texture mapping for each VisualARQ object in the model.