Sure, that's just a conditional suppression.  Easy as pie.

Right-click on the field.
Go to Format Field.
Go to the Common tab.
Click on the "x-2" button next to where it says "Suppress".
Enter the criteria to suppress the field.  This might look like:

@LineItemTotal = 0

or

Instr({MyReport.PartID},"kit") > 0
//This would indicate that the part ID had the word "kit" in it, if that's the indicator you want to use.

That should pretty much do it.  The last step is to go buy Brian's book.  Because it will help with all the newbie questions, and even answer ones you haven't thought to ask yet.