An unclassified local road near me in the UK changes its name about half way along but the whole length has been given just one of the two names. I can see how to change the name of the whole length but how do I change just part of it and mark where the change takes place?

An unclassified local road near me in the UK changes its name about half way along but the whole length has been given just one of the two names. I can see how to change the name of the whole length but how do I change just part of it and mark where the change takes place?

An unclassified local road near me in the UK changes its name about half way along but the whole length has been given just one of the two names. I can see how to change the name of the whole length but how do I change just part of it and mark where the change takes place?