Marc, I'd like to help but your questions is very vague and it's a beautiful sunny day!

Are you referring to the app or the website?

Do you have an example route to share?

As for

As it is now you can search for a spot but if you add to end or to route it redraws your entire map often sending you on a completely different trip.

Can you clarify how you are doing this? Using the website I can do this without any diversions for points 'at end' or 'via'.

As a general rule, to prevent CT rerouting add viapoints to the original route. 

Hello. Sorry I was not clear. I had a feeling. :-) I am referring to the website. So, I draw a route from Point A to Point B. Later on I discover that we need to alter Point A or B or both as we now have a more clear idea of those point. IE, routed to a city but now have a better idea of where we need to end up in that city as opposed to a general location. I have an address of where I would like to start or end. In RWGPS I can search for that address and start to modify either the start or end point to hit that location. Nothing else changes. I can not find a way to locate an address in CT to find that point. Even if I mouse around to manually find the location there does not seem to be any way for me to move the start or end without the entire route changing. But, based on what you just wrote I suspect if I just add a via point near the existing start or end and then add another point where I want to move to that should do the trick. SO, assuming that works what is the best way to locate an address on the map without making it a from or two point? Thank you.

Marc, thanks for clarifying. You may find it helpful to check the help section, recently revamped and easier to use. 

what is the best way to locate an address on the map

Say you wanted to cycle from Koblenz to Koln in Germany. On the map we can start to write 'Koblenz' in the 'From' box and see something like this

Simply choose the most appropriate start point.

Alternatively, if you wish to start from a specific address we can try that too (taking local naming conventions into account):

Now, you've plotted your route from Koblenz (specific address) to Koln (general address).

Later, you find a nice hotel and want to adjust your route to reach that,

With the route open, click on 'Add via Point' under the Routing Options (Any, Paved etc.) 

You'll see something like this and you can use it as we previously did - searching by name or address

When you choose an option you'll see something like this asking if you want to add the viapoint at the end of the route or within the route

 Make your choice (End) and you'll see something like this:

 Note: CT has added a Viapoint at the original destination (original route) and added your new finish point after that. 

That's it. You did not give an example route and based on experience, the address search feature can be more or less effective in different places, partly due to language, naming conventions etc. Is it the 'Hotel Europa' or the 'Europa Hotel'? 

Tip: To add a specific address at the start, first reverse the route so the start is now the end, add as above, then reverse the route again!  

If you're not aware, CT has the ability to search for accommodation near a route. Simply right click on any route 

Choose nearby accommodation to see something like this:

Also, I may be wrong but I'm thinking that you're planning a multi night trip and going back to change start/end points as you find accommodation? In that case CT has you covered with the 'Overnight stop' feature. Check it out - it's very useful! 

A quick note in relations to viapoints: I'd always suggest adding viapoints once we're happy with a route - not just to make the route go where we want it to go. It prevents significant recalculation and rerouting when I later change something. VPs are also very useful for writing notes to ourselves about specific points that can show up on GPS screens & PDFs