Extend solid face to curve?

I need to extend the angled faces of a solid up to a curve and I can’t find any command to do this. It is possible to extend a solid face on angle (tappered)?

You can use _ExtrudeSrfTapered on your rectagle surface, or you can explode your object and use _ExtendSrf on each separated surfaces, or may be better , extrude your curves straight then cut after.