[whpalmer4]

Don't most of your projects containing these troublesome tasks reside in one city or the other? If you have a folder of projects for City A, and a folder of projects for City B, focusing on one folder will hide all but the tasks relating to projects in that folder. Projects that are globally applicable can go in a third folder. Select the global folder plus the folder for the city you are in and hit the focus button. Save as a perspective for easier use.