Courtney Wilkins,
For future reference, the proper Adobe Forum to post such questions is the
LiveCycle Designer ES forum.
Have a look at the "Purchase Order -- Dynamic Interactive" sample that ships with Designer. You'll find it in the following folder:
{Designer_install_location}\{version}\EN\Samples\Forms\Purchase Order\Dynamic Interactive\Forms
It's a great example of a dynamic table with various sums.
As for the "item number", I'm assuming you mean the row index. If that's the case, then lets say you have a cell in your repeatable table row named "RowIndex" which is a text field. Also assuming you're running Designer 8.0 or later, you would add the following script to the row's IndexChange event (in JavaScript):
RowIndex.rawValue = (this.index + 1) + ".";
For more info, you could try the following posts and comments on my blog:
Calculate Scripts and
Instance Manager Object Reference.
Stefan
Adobe Systems
More answers at
Stefan Cameron on Forms.