valuing non-inventory assets on balance sheet

Is there an easy way to report the total value of non-inventory items that have been entered with a Bill but not yet invoiced? Our balance sheet is always negative due to the fact that we always have some
amount of purchased but unsold non-inventory goods. I know there are some cumbersome ways to determine this amount, but I wonder if I am missing an easier way. Currently I assign these to a Customer:Job of "TBD" when entering bills. This results in an easy to make report, but then I have to go back and change the Customer:Job to the real customer when the item is invoiced.
Thanks, rwm
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