[Gmsh] Subtract elementary volume entity from physical volume using ID

[Alex Lindsay]

I have a large lattice geometry generated by for loops and extrusion. I 
have a physical volume called "fuel" composed of 841 elementary volumes; 
addition to the physical group is done automatically in the for loops. 
The "fuel" geometry is attached. I want to remove one of the elementary 
volumes from the physical volume. Through the GUI, I know its ID. With 
the information I have, can I do what I want to do? Or other suggestions?

Alex
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