FIFO Inventory- COGS & Inventory Valuation

Excel & VBA Gurus,

I had been trying really hard to get some solution on COGS valuation & inventory valuation on FIFO basis. my daily transactions are typical sales & purchases.
Attached is the inventory in/out movement from Quick Books. in the column "Num" type bill is the entry from purchase bill whihc always has a reference as P/O####. This is how i will capture the landed cost against a PO., another type "Inv Adj" is inter warehouse transfer. Name is cusotmer, Inventory is my item number. in some cases it is like "2000", in some cases it is 10000:10121, and in some cases it is 10000:10200:10201 that is why they fall in different columns when i export them.
What I would lilke to do: 1) Run a report by month, by customer showing cost of goods sold on FIFO basis, I can capture sales amount by running another report.
Please let me know if you need any other info.

Thanks