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salesforce instancesalesforce instance 

adding formula in trigger

Hello

I have one workflow in which i have updated the formula as
IF( TEXT( SBQQ__SubscriptionPricing__c ) = "" , Net_Unit_Price_Monthly_WFR__c * SBQQ__Quote__r.Exchange_Rate_to_EUR_WFR__c * 
IF(TEXT( SBQQ__PricingMethod__c) = 'Block',1,SBQQ__Quantity__c) , Net_Unit_Price_Monthly_WFR__c * SBQQ__Quote__r.Exchange_Rate_to_EUR_WFR__c * 12 * IF(TEXT( SBQQ__PricingMethod__c) = 'Block',1,SBQQ__Quantity__c))
it is working now but i want to populate this formula field in below trigger.

trigger QuoteLineupdate on SBQQ__QuoteLine__c (before insert, before update) {
   for (SBQQ__QuoteLine__c QL: Trigger.new) {

    if (false && trigger.oldMap !=  null && trigger.newMap != null){  // debugging aid Wim van Beek 
        List<String> Flds = new List<String>();
        For (Schema.SObjectField FieldInfo : Schema.getGlobalDescribe().get('SBQQ__QuoteLine__c').getDescribe().fields.getMap().values()){
             String FieldName = string.valueOf(FieldInfo.getDescribe().getName());
             Flds.add(FieldName);
        }
        SBQQ__QuoteLine__c OldQ = trigger.oldMap.get(QL.id);
        SBQQ__QuoteLine__c NewQ = trigger.newMap.get(QL.id);
        for (String Fld: Flds){
            if (OldQ.get(Fld)  != NewQ.get(Fld)){
                system.debug('------ Fld Line '+ Fld + ' : ' + OldQ.get(Fld) + ' ==> '+NewQ.get(Fld));
            }
        }
    }
            
            QL.Sales_Price_Term_translation_for_ACV__c=QL.Sales_Price_Term_for_ACV__c;
            QL.Sales_Price_Term_translation_for_MCV__c=QL.Sales_Price_Term__c;
            QL.Sales_Price_Term_translation_for_TCV__c=QL.Sales_Price_Term_for_TCV__c;
            QL.sbFamily_Grouping_in_Template__c = QL.Quote_Line_Grouping_in_Template__c; 
            system.debug('QL.SBQQ__Quote__r.SBQQ__CustomerDiscount__c'+QL.SBQQ__Quote__r.SBQQ__CustomerDiscount__c);
          //  QL.Sales_Price_with_header_discount__c = String.valueOf(QL.Sales_Price__c * (1 - QL.SBQQ__Quote__r.SBQQ__CustomerDiscount__c/100));
             }
  }


Could anyone help on this.