Customer wise production report

Suppose sales order 1 has got X-5 pcu2019s, Y-4 pcu2019s. Sales order 2 has got Y-5 pcu2019s, Z-7 pcu2019s, sales order 3 has got x-10 pcu2019s, Y-5 pcu2019s, Z- 10Pcu2019s. These three orders are from same customer. This 3 orders are in production. Now how I can track for Material X and Y for this customer( at which stage is the X and Y)?