Editing the Section line of an Existing Section

I have an existing section that comes from its parent view showing a cross section

arrow cutting straight accross the assembly.  I now need to edit this section line to

only cutting across straight half way through the assembly and then going down then over.

Creating a new section view wouldn't be a problem except that I have section views trailing

off of this section view.  Is it possible to edit this section line like I am describing?

Thanks

SolidworksDrawings And Detailing