Hi Mark (a.k.a. Phobos),
Welcome to Laptop GPS World.
The above screenshot depicts Microsoft Streets and Trips with over 2,800 imported locations. You should have no problems with 200 addresses. I personally use the import feature very seldom, and I hope you will get feedback from others who actually use the feature. Streets & Trips will allow you to select your desired destinations, and then it may even optimize them, so you do them all in the fastest time.
After you are done, you may delete some of the imported addresses, or you may delete all of them at once.