Install in localhost without downloading images

Hello,

Troubleshooting webs I always download it and I work in localhost. In some cases, as in woocommerce big sites, there are thousand of images, and I have problems with download them (problems with the server, with the time to download it…).
Talking with people in a Wordcamp, they told me that in those cases (many images) they download the web without the images, and after, they put something in the wp-config that allow them to point to the images url in the original web.
Then, they have the web in localhost and they see the images, but the images are in the original site, not in localhost.
I do not asked what was the code to put in the wp-config to do this.

Do you know how to make this? It would be very helpful.

Thanks a lot!