Access - How to Get Summary Totals that include an Item that is Blank

Hello Experts,

I have attempted to get the desired result multiple ways in Access 2007 but alas I don't know enough to get it to do what I want.

I have a dump of a General Ledger system's (GL) data that I am using Access to summarize some data for me.  The export from the GL system is always in the same layout that I then import into Access.

The two fields with important data that I am using to get summaries for from the GL system are:
[GLDataName]
[Item]

Whenever the user is keying in information to the original GL system they generally assign the item being purchased to an [Item]  But they don't always assign it.  So on a lot of occasions that [Item] field is blank.

Whenever the cost/expense that is being keyed in into the GL system if it is a cost/expense associated with a "Job", then the system puts the "CustomerJob" name in the field [GLDataName} and it always puts who the expenses is paid to in a field called [SourceName]
 
I have created a table called tblCustomer so that whenever the field {GLDataName] has an entry that is associated with a Job I can summarize by that name.  

I have created tables called:
tblQBInventory
tblJCInventoryItemGrouping

I brought all of the "Items" that are used in the field "Item" into that table tblQBInventory and then assigned each to tblJCInventoryItemGrouping


What I am trying to summarize is All costs for a Job by Job Name and InventoryItemGrouping  whenever the expense is associated with a Customer.  I can get it to work if the user input an {item] in the appropriate field.  But if they left that field "Blank" then it ignores it.  Is there a way to get my query to include "blank" [Item].

I tried adding an Inventory [Item] where the name field was blank and that didn't work.