[Gmsh] Define a region

[Mazanakis george]

Hello gmsh users,

I Need you Help please.

I have a wind blade model. Whole model was defined with only one volume

I create a mesh with brick elements 

I want to know how can I separate the 3d elements which are located between two surfaces without create a new volume.

For example
I have a wind blade model (one volume all the blade so i canot use the physical volume option) and I want to know which of the element are related to the blade's webs


Thanks in advance
 P.S. Sorry if this is a double post
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