Transition

[immortius]

All the subtractive map option does is place an additive brush the size of the level into your map. You can select and delete this brush to change to an additive map, or add your own additive brush and subtract from it to make a subtractive map from an additive one.

[burt1870]

is possible to transition from a additive map to a subtractive map and vice versa? and if so how?