Creates a new branch on a secondary Git repo (i.e. fork) with the contents of a branch from a primary repo:
git fetch SOURCE_REMOTE SOURCE_BRANCH:NEW_BRANCH_NAME; git checkout NEW_BRANCH_NAME; git branch -u TARGET_REMOTE NEW_BRANCH_NAME
i.e.
git fetch origin 3.7.0:foobar-feature; git checkout foobar-feature; git branch -u fork foobar-feature