Hi Ed,
I think that this is a typical scenario for snowflake schema. Of course you
can apply snowflake schema to design BrokerContact as a separate dimension
and reference DimBroker to it. It is simple and clear.
You may refer to the following article:
Introduction to Dimensions
http://msdn2.microsoft.com/en-us/library/ms175439.aspx

If you have any other questions or concerns, please feel free to let me
know. Have a nice day!

Best regards,
Charles Wang
Microsoft Online Community Support
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