row 1 headings
a2 0
b2 0
c2 3
d2 =C2+B2-A2 formula

similarly
a3 2
formula b3 =D2
c3 1
d3 (when you drag down d2 , d3 becomes =C3+B3-A3

now take cursor to right bottom of D2 it will turn into +
drag this down
similarly drag B3 down.
is this ok for you
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Mostropovich wrote in message
...
I would like to create/find a spreadsheet with formulas that does the
following:

1) start with: input Sales=0, automatic OpeningStock=0, input Order=3,
automatic ClosingStock=3

2) next time: input Sales=2, automatic OpeningStock=ClosingStock of
previous
session=3, input Order=1, automatic ClosingStock=2

and so on.
Can anybody help please?