[talk-au] How to map CBD boundaries?

[Joel H.]

I just downloaded an export of NSW boundary data from OSM. Now in this 
dataset a locality called "Tweed Heads" has been included, The problem 
is that is area only covers the CBD and not the city (including all 
suburbs) as a whole.

How should I go about mapping this CBD boundary?

Also if anyone who handled the imports can send across an OSM file 
containing only the city limits, or could add them, would be great!