I have created for you the utility - MultiMapkey.exe
With ProE/Creo functions - the Mapkey and MultiMapkey utility you can Easy, Quickly, How you need it modify 3D and 2D parametric data. You can export your objects or specify model properties and parameters, etc. >> try to imagine what you need to apply for huge list of data.
In the video example you can find all steps: How to use 4K-app: MultiMapkey - how to use custom steps ... for ... modification, creation, export, ... the object defined in the list (folder)
That's a pretty neat tool. How does it do with nested mapkeys?
...with nested mapkeys is not problem (it is only shorten input information)
How to use nested mapkeys Example: create a couple of Mapkeys in your main config.pro file. Define source file as combination of "nested mapkeys" + add at the end backslash + new empty row. Be careful - utility alway delete first row (where in standard Mapkey is name and label) from the source file (from source Mapkey file for repeating)
Backslash means - new generated mapkey will be continue.
Note: I have tried to add backslash and empty row automatically ... but sorry - I am not programmer