Questions Seemingly Simple iif Statements

Hey guys.  I'm new to Report Designer & need a little help.  What I'm trying to do seems as though it would be simple.

I have a shipping confirmation report, and on that report, I want to populate a Details line with all appropriate info IF [SOShipLine.ShippedQty] is greater than 0.  If a qty of zero was shipped, the Details line for that item doesn't need to be populated at all.

I'm trying to use the following iif statement to achieve this first in the "Item Name" field on my report:

IIf([SOShipLine.ShippedQty]<>0, [SOShipLine.TranDesc])

I'm using this statement here on the designer:

On the resulting report, the error I'm getting is:

I DO know that the following iif statement works properly in the report, so I'm trying to use its syntax while building my iif statement:

=IIf([SOShipLine.InventoryID]<>Null, Format( '{0}: {1}', [SOShipLine.InventoryID],[SOShipLine.TranDesc]),[SOShipLine.TranDesc])

(Here's where that statement is):

Lastly, and this is really important to me, what I truly want to do is leave the entire line empty if qt shipped is zero.  Is there a relatively quick way to do this, or will I have to use iif statements in every field along that line in Details?

Thanks very much in advance for your help, guys!

Adam