power plane / trace strategy drawing
It all depends on which PCB design software you're using.

For example, with the popular Eagle software to create a plane you simply put a polygon over the whole board - but then give it a low priority to allow every other feature to dominate and "carve it up" according to the required separation parameters. By labelling it with a name (e.g. "GND"), Eagle also will automatically connect to the polygon where it needs to.