In Part/assembly it's View > Section
To get the cutaway view into draft, apply the section view, then go PMI > Model View.
This should automatically add the cutaway to the PMI stuff.
If you want to apply the cutaway view to a draft view, place the view then on the View > Properties > Sections select the section to apply.
At a previous job the main assemblies were 25K parts and to keep the drawing size down we put one view per draft file.
Some sheets were purely a section through the machine, which meant having a source view to cut the section.
I started using the section view command in assembly to get away from having to have the source view.
By the way, you can fold another view from a sectioned view and it will maintain the section.
bc.
2.4GHz Core2 Quad, 4GB RAM,
Quadro FX4600.