hi.
I need a formula that automatically sums down to the first blank cell.
In the data below i need a formula for the Total lines below...sometimes
there are 3 styles , sometimes 2 styles, sometimes 1 style. But i don't want
to have the user to have to adjust he formula every time as it will add risk
for human error.
any suggestions?

Total 450
Style A 100
Style B 200
Style C 150

Total 200
Style D 150
Style E 50

Total 250
Style F 250