We cannot add more territories in 'Territory' field in 'BricktoTerritory' Object as well as same issue in 'Territory Vod' field in 'Account' object . Both fields are dependent hence failing to add more territory codes.
Now the character limit is only 255 for those fields. It should be good to increase limit for further release.
I have combined this information into one post. You may add additional comments to this post.
See the following Brick-to-Terr post that was answered by our Product Manager, Dan Kallman