You should have done this when you applied the first set of changes, the one you specify.
The branch name is constantly saved as part of the change set, so in this case, the change set is definitely on the branch, they just are on the default branch.
The only way to retroactively embed a new branch name in a change set is to reinstall the change sets one at a time into the repository that does not have them, then you will have a new chance to get the branch name.
Are you sure you want to name the branch? You cannot get rid of it (without performing the same exercise as it is there) if it is, therefore, if it is temporary, the name does not correspond to reality.
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