How to replace a whole class?

Hello,
What is the best and fastest way to replace a whole LabView class by another one?
I have developed an application based using a LV class. Then I have copied the class to a new location and improved it and I have developed new VIs in the copied class. Now I would like to bring that class back to the application with a simple "replace with...". But in the context menu it is grayed out.
The reason why I copied the class to a new location is that I wanted to keep a running version of my project and to make some minor changes in the main VI. The changes in the LV class took more time and where some basic changes in concept but without affecting the names and the connector of the subVIs. So a simple replace all VI would do. Does anyone knows whether there is such a tool? Or how do I perform this?
Regards, Jörn

I am aware of changing a SubVI with Find and Replace. But the class which I have created consists of about 40 VIs whereby some of them are used about 10 times in the main program. So changing them manually takes some awful time. (The last time when I tried to do it this way LabView 8.6 crashed multiple times so I need to spend this awful time repeatedly.) While replacing the VIs of one class by the VIs of the new class both classes get mixed up. Easily VIs of the old class get overwritten by mistake.
Do you think it is reasonable to
1. change inheritance to make the old class an ancestor of the new class
2. change the class Ctls (which by the way cannot be searched using CTRL + F) from ancestor/old class to child/new class
3. save the main VI
4. undo the inheritance
Regards, Jörn

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