Hello Cgerhold and welcome to the forum!
This is a pretty old thread you were digging up here. [;)] Most things that are valid for VI, are also valid for VI Pro.
Did you download the latest version of the "VE Woodwinds + Brass" sound set? It includes VI and VI Pro presets for the Dimension Brass and a readme file. You will find more information on how to use the Dimension Brass with Sibelius there and in the latest version of the "Optimizing Sibelius Playback" manual.
http://www.vsl.co.at/en/68/141/460/576/655.htm
If this shouldn't help you, can you please discribe your problem(s)?
Best regards,
Andi
Vienna Symphonic Library