Find directories by file extension and copying/moving somewherelse

I want to search by file extension and by texts and then copy a binary file inside the same folder. For instance, I am in directory A and finally like to copy all *.gdx files (in B,C,D) to somewhere.
A 
|-- B                             
|   |-- file1.out (a text file)                   
|   |-- file1.gdx (a binary file)           
| 
|-- C       
|   |-- file2.out (a text file) 
|   |-- file2.gdx (a binary file) 
| 
|-- D       
|   |-- file3.out (a text file) 
|   |-- file3.gdx (a binary file) 
Here is my code:
cd 'find . -maxdepth 2 -name "*.out"|xargs grep "sometext"| awk -F'/' '{print $2}'|sort -u ' && ' find . -maxdepth 2 -name "*.gdx" -print0|xargs -0 cp -t /somewhere'
The problem here, if first find captures multiple folders then copy only one *.gdx file from the first folder, not all *.gdx files from all folders. I believe it has to be done by loop, but don't know how to script.