Customizing create production order screen

I have a create production order screen , where in I need to customize and add two new column on create process.

I want to extend the below code, which is on the CreateProductionOrdersProcess acumatica code, but I am not able to achieve that.

        public static void CreateProcess(List<AMFixedDemand> list, ProductionOrdersCreateFilter filter)
        {
            var prodMaintGraph = CreateInstance<ProdMaint>();
            var createProdOrdersGraph = CreateInstance<CreateProductionOrdersProcess>();

            Numbering prodNumbering = PXSelectJoin<Numbering, LeftJoin<AMOrderType, On<AMOrderType.prodNumberingID,
                        Equal<Numbering.numberingID>>>, Where<AMOrderType.orderType, Equal<Required<AMOrderType.orderType>>>
                        >.Select(prodMaintGraph, filter.CreationOrderType);

            if (prodNumbering == null)
            {
                throw new PXException(Messages.GetLocal(Messages.NumberingMissingExceptionProduction,
                    filter.CreationOrderType));
            }

            if (prodNumbering.UserNumbering.GetValueOrDefault())
            {
                throw new PXException(Messages.GetLocal(Messages.ManualNumberingNotAllowedForProcess,
                    filter.CreationOrderType));
            }

            createProdOrdersGraph.CreateProductionOrders(list, filter, prodMaintGraph); 

        }

I can create a delegate , modify the CreateProductionOrders function.
However, this function is utilized across several other pages.  

        public virtual void CreateProductionOrders(List<AMFixedDemand> list, ProductionOrdersCreateFilter filter, ProdMaint prodMaintGraph)
        {
....
}

Could anyone please suggest an alternative approach, to populate additional columns on create process action.