Before it was easy since any parsys on the page could be configured in design mode and then you could just import the node structure generated in etc/designs/project/template into your project. Right now with policies things don't really work as I would expect. It's very simple to test this. Just create an empty component and in it's component.html add
<sly data-sly-resource="${par @ resourceType='wcm/foundation/components/parsys'}"></sly>
or
<sly data-sly-resource="${par @ resourceType='wcm/foundation/components/responsivegrid'}"></sly>
Drag this new component onto one of your pages. I couldn't find a way to configure the parsys in the component with policies. If I create the par node in crxde there is a strange behaviour where I end up with two parsys containers in my component for some reason - one seems to inherit the policy from the parent and one that I still can't configure. I'm inclined to think this might be a bug.