I dont know if this is the right place to ask this question but i am looking
for a simple excel formula to create a cutting list.

ie

1200
1400
1800
2000
600

The above lengths needs to be cut from 4000
so 1200 + 1800 = 4000 and 1200+2000+600 =3200
so i require 2 lengths at 4000, surely its a simple excel formula, any help
would be much appreciated.