Hello,
Been working with one of the default characters Zane.
Is there a way to merge all the body parts, hair vest, etc etc into a single mesh.  

The reason i'm asking is because i assume it is the cause of certain meshes (vest and hair) not rendering when exported to gltf format.  
I've attached a pic of the final gltf file inside A-frame where the hair and vest are missing.  The fbx import into blender shows all parts including the hair and vest however exporting to gltf seems to make them vanish.  To help debug i want to combine all parts of the character into a single mesh to force the gltf to export all parts of the character.

76% of original size (was 659x19) - Click to enlarge

Any advice would be appreciated.  I did some research and found that inside the xchange7 pipeline program this is possible however when i open up the exported FBX file the option to "Merge body  parts into single mesh" is greyed out (see image below) 

76% of original size (was 659x19) - Click to enlarge

That merge body parts you're referring to was for older generation characters that has separate upper body, lower body, head, hands, and feet.

Thanks for the clarification Rampa,
Any suggestions on how i can turn the character into one mesh on fbx export or prior using ic or cc?