Yes, the way I control it is through layers. Create a Fascia layer, and then after you applied fascia to the roof slab, edit the roof slab style. Go to display properties, and check the "Style Overide box" for Model. Edit display properties and un-check the box "Material" Box. Select the "0" layer and change it to the fasica layer you created earlier.
Now when you import to 3Dmax, you can select the fascia component via the layer tool and apply materials.
This also works good for different wall coverings on one wall style, railing styles, basically any styles that you want to be able to control components independently via layers.
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