Split open brep with multiple curves???

Hi

I'm trying to split a joined list of surfaces by a list of curves but I cannot find a component that does that. Basically, I just want to perform the same as the Surface Split component, which doesn't work with open brep...

I know that I can extrude the curves and then use split the brep with multiple breps (which would work in this 2D situation) but I'm looking for general procedure for when there isn't an obvious direction for the extrusion...

Any suggestions? 

//Peter