You do not need the SUM function with a simple multiplication, presuming you
are totalling qty*price (B2*D2) for each line to make a final total at the
bottom, on each line type
=B2*D2
Press enter and then return to the cell you just entered. In the bottom
right of the cell is a small square (the fill handle), drag that down as far
as your data goes and Excel will adjust the formulae
If you don't want a line total, but just a total for all the stock, go to
the bottom and type
=SUM(B2:B100)*(D2

100)
(presumes 100 is the last line) and press Ctrl+Shift+Enter. (If you do this
right Excel will wrap { } around the formula. This is known as an array
formula and Excel is effectively multiplying each line with it's
corresponding cell on the same line and then doing the sum
--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
(e-mail address removed)