Shorter formula

[fivermsg]

D3 is the a cell holding a total, d12 threw d428 at every 8th interval to deduct from the total in d3.

=D3-(D12-D20-D28-D36-D44-D52-D60-D68-D76-D84-D92-D100-D108-D116-D124-D132-D140-D148-D156-D164-D172-D180-D188-D196-D204-D212-D220-D228-D236-D244-D252-D260-D268-D276-D284-D292-D300-D308-D316-D324-D332-D340-D348-D356-D364-D372-D380-D388-D396-D404-D412-D420-D428)

[oldchippy]

Take a look at this link and apply to a column

http://exceltips.vitalnews.com/Pages..._in_a_Row.html

[shg]

D3 is the a cell holding a total, d12 threw d428 at every 8th interval to deduct from the total in d3.

Your formula is not consistent with your description; it should be either

=D3-(D12+D20+D28+D36+D44+D52+D60+D68+D76+D84+D92+D100+D108+D116+D124+D132+D140+D148+D156+D164+D172+D180+D188+D196+D204+D212+D220+D228+D236+D244+D252+D260+D268+D276+D284+D292+D300+D308+D316+D324+D332+D340+D348+D356+D364+D372+D380+D388+D396+D404+D412+D420+D428)

or

=D3-D12-D20-D28-D36-D44-D52-D60-D68-D76-D84-D92-D100-D108-D116-D124-D132-D140-D148-D156-D164-D172-D180-D188-D196-D204-D212-D220-D228-D236-D244-D252-D260-D268-D276-D284-D292-D300-D308-D316-D324-D332-D340-D348-D356-D364-D372-D380-D388-D396-D404-D412-D420-D428

Assuming that's so, then

=D3 - SUMPRODUCT( (MOD( ROW(D12:D428) - ROW(D12), 8) = 0 ) * D12:D428)

[daddylonglegs]

Is there any indication in any other cells which cells to sum? E.g. if C12, C20, C28 etc. say "Total" you could use a formula like:

=D3-SUMIF(C12:C428,"Total",D12:D428)