Another play to tinker with ..
(along lines similar to pinmaster's)

Sample construct at:
http://www.savefile.com/files/5708237
SimpleInventory_EinsteinMC2_misc.xls

In Sheet1,
Headers in A1:D1 as per below, data/formulas from row2 down:
Part#, Dept, QtyIssued, RemQty

In D2: =IF(C2="","",VLOOKUP(A2,Sheet2!A:D,4,0))
D2 copied down
(Col D returns the remaining qty/stock from Sheet2's col D)

In Sheet2,
Headers in A1:E1 as per below, data/formulas from row2 down:
Part#, StartQty, TotIssQty, RemQty, Re-Order?

In C2: =SUMIF(Sheet1!A:A,A2,Sheet1!C:C)
In D2: =B2-C2
In E2: =IF(D2<25%*B2,"Yes!","")
C2:E2 selected and copied down

Col E provides a simple alert to monitor the stock level in col D (RemQty)
Adjust the 25% threshold (arbitrary) to suit
--
Rgds
Max
xl 97
---
Singapore, GMT+8
xdemechanik
http://savefile.com/projects/236895
--
"Eintsein_mc2" wrote in message
oups.com...
Would be great if some one could help. I have an inventory list which
would have over a 100 different products on it. These products are
distributed to different departments in my business. Sheet 1 I type in
the department name then part number and how many items, then vlookup
brings up the info. But I can not work out how to subtract the amount I
just entered from the inventory list which is in sheet 2. The same
product can go to many departments. Have tried this but will only work
on one line. =IF(Sheet1!A1:A100=100,(Sheet2!C1-(Sheet1!D1:D100)))
"100" being the part number. Thanks in advance.