Workflow for upstreaming patches

[Mic92]

I have my own branch where I have a collections of patches on my local master branch.
I would like to create a PR branch for each of them that is based on the upstream branch.

What is your workflow for that?
In the Commits window there is branch-off function bound to n. However this will base a branch based on current master with unrelated commits that also live in my local master.

Edit
My workflow in plain git would look like that (origin is my my fork, upstream is the project I want to upstream patches to)

$ git checkout -b some-feature-branch-1 upstream/master
$ git cherry-pick some_commits_related_to_feature_1....
$ git push origin some-feature-branch-1 # than click on the PR link provided by github/gitlab in the push event)
$ git checkout -b some-feature-branch-2 upstream/master
$ git cherry-pick some_commits_related_to_feature_2....
$ git push origin some-feature-branch-2 # and open a different PR just with these commits

Usually I would actually use tig master while being in some-feature-branch-1 instead of git cherry-pick and have a cherry-pick key binding to quickly get my commits into a feature branch. ( I am still missing this command line flag in lazygit to see a different branch from the current one, but this is another story :))

[jesseduffield]

First off: apologies for the late reply, github didn't send me notifications about comments in these discussion threads!

I'm not sure that I understand your use case. Could you describe how you would go about doing this on the command line?

[Mic92]

Thanks. I expanded the explanation.