You will want to create multiple data sources and then tie your BOs DataSOurceKey property to the correct connection. This can be done programmatically at run-time as well. First setup your data sources:DataBasics.DataSources(New SqlDataSourceItem("","My SqlConnection;Database=ApplicationSpecific;"))
DataBasics.DataSources(New SqlDataSourceItem("MASTER","My SqlConnection;Database=Master;"))
Next, on the BO you will want to assign the the DataSourceKey to any BO that needs to talk with the MASTER instead of the default ("" - Empty String By Default) connection. You can set this on the property sheet of the BO or set it in code:
MyBO.DataSourceKey = "MASTER"