How to Forecast and run MRP for consumed materials

Hi Experts,
I need help urgently on below business requirement.
Objective: Forecast consumable materials (like Gas , Chemical) to produce Finish product
Scenario:
1. We have Plant WF01 - to produce finish products, Sales related activities, SOP for sales forecast, and production planning
Production BOM Like below
    Finish part (material used to make production, Sales, Shipment)
    RAW (Component used to make Finish Product)
2. We have other plats with in same company for GS01 - for GAS related materials, CH01 - For Chemical Related material
      - Material under GS01, CH01 does not have BOM
      - Gas and chemical material used during production process to make finish product
Question:
          - How Can I forecast(to procure from external), how much GAS/Chemical required to meet future demand from SOP
          - How can I link SOP to forecast GAS and Chemicals because we don't want to base on historic usage
          - Please share best practices if any

Hi All ,
Thank you for help. Understand we can use CBP for non BOM components planning.
But SAP has standard forecasting models(based on historic/trend/Seasonal etc.).
Can we define our own forecasting model to generate fore cast values.
Ex:
Based on history
      Com1 - requires 100PC in Mar and 150 in Apr
But what we require is , We need to base on usage rate(to make finish product) and SOP forecast to determine raw material forecast.
     i.e
          SOP: FinishGoods 1000pc in Mar and 2000PC in Apr
          based on SOP, I need raw material comp1 500PC in Mar and 1000PC in Apr
          formula: Lets say Usage rate for Raw Comp1 is 0.5PC to produce 1PC of finish goods
               Forecast: 0.5PC * 1000PC = 500PC
                               0.5PC * 2000PC = 1000PC
                                   Usage rate * Demand = Raw material forecast value
          usage rate and demand are dynamic and can change.
Is there any way in SAP to determine forecast of components based on formula.
Thank you.
Rayudu

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Hi Ahmed Rifaee
Thanks for your reply, I will talk about process in SAP.
So, I have 2 WBS element, that's simple because my project is have about 200 WBS element.
WBS1 have 2 order reservation for each actvity and material A0001 be use in 2 order reservation.
Order Reservation 1 needs 3 A0001
Order Reservation 2 needs 5 A0001
WBS2 have 1 order reservation for each activity and material A0001 be use in it
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