Blender Neck-Only GLB Export

I’m handing over a .blend file that contains a full-body character. Your task is to trim away everything below the base of the neck, leaving only the head and neck exactly as modelled. Once that cut is done, export the result as a GLB that:

• preserves every original texture and material
• keeps the existing mesh untouched—no extra smoothing or simplification
• is organised inside the GLB by material groups

I’ll test the file in a standard GLB viewer and inside my real-time engine, so it needs to load without errors and display the same look I see in Blender. When you’re finished, send back the single GLB file; no additional assets are required.