Catalogue glass as separate thickness variants

Define each available thickness of a glass type as its own catalogue entry so plain, black tinted and brown tinted glass are catalogued per thickness.

1. Glass is catalogued as separate thickness variants rather than one material.

   ✓ ১১ অক্টোবৰ, ২০২৬ তাৰিখে প্ৰডাক্টত পৰীক্ষা কৰা হৈছে

2. For a given glass type (plain, black tinted, brown tinted), you define each available thickness as its own entry, e.g. 4 mm, 6 mm, 8 mm, 12 mm.

   ✓ ১১ অক্টোবৰ, ২০২৬ তাৰিখে প্ৰডাক্টত পৰীক্ষা কৰা হৈছে