Please let me know, if you get any answers.
Below is my issue statement. which is similar to you.
e.g.
Assembly items
1. L-Angle 3x2 ; Stock# 12345 ; Length 8in ; UOM inch
2. L-Angle 3x2 ; Stock# 12345 ; Length 10in ; UOM inch
3. L-Angle 5x3 ; Stock# 12346 ; Length 15in ; UOM inch
4. L-Angle...