Answer
Yes: you can add your own tables into the Millennium database. 

Note: You should not start the table name with the names of any Millennium tables, that can cause an issues if you include these tables in reports run through Millennium GUI.
Article Type
Product Info
Product Line
Millennium
Product Module/Feature
Data Consolidation
Data Issues
Data Management
Product Version
2013.5
2013.4
2013.3
2013.2
2013.1
2013.0
Pre-2013
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