You can in fact do this from the web UI: https://github.github.com/gh-stack/guides/ui/#creating-a-sta...

I must have missed that. Amazing! From a reviewer's POV, this will be so nice to at the very least remove diff noise for PRs built on top of another PR. I usually refrain from reviewing child PRs until the parent is merged and the child can be rebased, for the sole reason that the diffs are hard to review i.r.t. what came from where.

damn, I missed it as well

presenting only cli commands in announcement wasn't a good choice