Given that we have some administrative area, how can we create lower-level administrative areas using the same external borders?

Hello,

I am trying to create administrative areas with admin_level=9, which would represent the structure of their parent area with admin_level=8. So, the external borders would be the same and the only added border would be the internal one between the two new areas with admin_level=9.

The specific case that I am talking about is this one.

I don’t understand how I should begin with creating the new administrative areas. If I just draw a new area like I would draw, for example, a park, then I don’t know how I can choose these already existing external borders as the defining borders of my new areas.

According to this excerpt from the official gazette of the town, the internal border between the two city districts should look like this:

Any help would be appreciated.

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