Hi to all :)

I'm running a stall on which I'm selling CD's.
Every CD has it's own, unique code number (#1000, #1001, #1002...) in
database (sheet #DATABASE).
I have following sheets:

- STOCK (current quantity of CD's by code number on my stall)
- DATABASE (database with informations about price, suppliers and
titles)
- SUPPLIED (CD's suppliers are bringing to me)
- SOLD (CD's sold to customers)


// Problem:

Supplier brings me 5x titles with code number #1000. I type it into
sheet #SUPPLIED,
which can consists of three columns (date, code number and quantity)
as well as sheet #SOLD.
Before I type it, I first check if title with that code number exists
in sheet #DATABASE,
if not I first type complete informations regarding it manually.
Before supplier brought me 5x titles with code number #1000,
I already had 3 of the same kind on my stock.

Now, when I type 5x CD with code number #1000 into sheet #SUPPLIED,
sheet #STOCK should lookup for rows and if it finds that CD title with
that code number
#1000 exists on stock, it should add 5 to existing 3. Also, when I sell
1x CD to customer,
with code number #1000 it should substract quantity (8-1=7).

Sheet #STOCK consists of 3 columns (code number, quantity and price).
Let's say that I can solve 1st and 3rd column with VLOOKUP formula but
quantity is what's bothering me.

I keep bumping my head for hours and can't figure it out...

Any tip?

Here is link to example file if attached does'nt working:
http://www.expertinternet.org/xls/STOCK.ZIP


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