Design table newbie

So I haven't every really worked with Design tables beforebut got assigned to take over an issue we were having with designtables that has prevented us from actually using them.

What we are trying to do is have a design table were a user can gointo and select a certain obround that we know manufacturingalready has a tool for, to insert into the model. The problem weare having is that....say you want to insert a bigger obround inplace of the previous one, from the design table...when the newobround is inserted into the model and replaces the previous one,somehow the connection of what the material thickness of the partis, is lost. This problem occured when the company was usingsolidworks 2006, and since then they have given up implementing theuse of the design tables, no one could figure out how to fix theproblem. Now that we have Solidworks 2008 they want to see if theproblem will still occur......my problem is, I have neverused/made/edited a design table and don't really know where tobegin. I know that the Design Table works with Microsoft Excel,which I am pretty good in. I know a variety of the formulas andsuch....
so can someone point me in the right direction?...SolidworksConfigurations design Tables