how to preserve relationships in xml schema designer when importing from database

Question

Hello,

This may not be posted in the correct category, but I didn't see a category for VS 2005 with .NET 2.0. 
I added a new XML Schema item to my project using the VS template.  It was a SQL Server database schema with about
170 tables.  I'm looking at it now in the XML Schema designer, but I don't see that it's preserved any of the relationships between the tables.  Is there a way to have the relationships automated upon import, or do I have to go in and somehow manually create all the relationships?  Also, I need to create a new entity that is going to be a combination of many columns from many of the tables.  I have been unsuccessful in figuring out how to create this new entity as well.  I am brand new to .NET and C# programming, but not to databases, so sorry if this is something basic that I'm just missing!

Thank you,
Laura