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My class subtracts the values of child account number fields from the current values of it's parent account number fields in a hierarchy. I need this class to run everytime a child account changes its parent (i.e the parent name field is edited to a new name). I'm attempting to have this trigger compare the old value and the new value of the parent field, when creating the logic for this trigger I keep recieving this error message:

Method does not exist or incorrect signature: void executeSub(Account)
from the type Parent_Subtract

Class:

public class Parent_Subtract {

public static void executeSub(List<Account> scope) {



    Id CRecordType = Schema.SObjectType.Account.getRecordTypeInfosByName().get('Customer Account').getRecordTypeId();

    Id DRecordType = Schema.SObjectType.Account.getRecordTypeInfosByName().get('Division Account').getRecordTypeId();

    Id SRecordType = Schema.SObjectType.Account.getRecordTypeInfosByName().get('Site Account').getRecordTypeId();

    Id ERecordType = Schema.SObjectType.Account.getRecordTypeInfosByName().get('Enterprise Account').getRecordTypeId();

    Id DSAccounts = '01270000578681Y';





        List<Id> listIds = new List<Id>();

        Map<Id, Account> parentAccounts = new Map<Id, Account>([SELECT Id, RecordTypeId, Parent_Account__c, Total_CCF__c, Total_Revenue__c, 

                                                                Total_Usage_kWh__c, Account_kw__c, AnnualRev FROM Account WHERE ID In :listIds]);

        Map<Id, Account> newParent = new Map<Id, Account>();

        Set<ID> setParentAcctID = new set<ID>();

        List<Account> listforFinalUpdate = new List<Account>();



    for(Account acc : scope){

        setParentAcctID.add(acc.Parent_Account__c);

    }



        List<account> listParentAcctData = [Select id, Total_CCF__c, Total_Revenue__c, 

                                                                Total_Usage_kWh__c, Account_kw__c, AnnualRevenue 

                                                                FROM account 

                                                                WHERE id =: setParentAcctID];

        for(Account a : listParentAcctData)

        {

            newParent.put(a.id,a);

        }



      for(Account acc: scope)

      {

        Account acct = newParent.get(acc.Parent_Account__c);



            system.debug('acc.Total_Usage_kWh__c:'+acc.Total_Usage_kWh__c);

            system.debug('acc.Total_CCF__c:'+acc.Total_CCF__c);

            system.debug('acc.AnnualRev:'+acc.AnnualRev);

            system.debug('acc.Account_kw__c:'+acc.Account_kw__c);



            acct.Total_Usage_kWh__c -= acc.Total_Usage_kWh__c;

            acct.Total_CCF__c -= acc.Total_CCF__c;

            acct.AnnualRev -= acc.AnnualRev;

            acct.Account_kw__c -= acc.Account_kw__c;



                listforFinalUpdate.add(acct);

        }               



        if(listforFinalUpdate.size() > 0)

        {

          update  listforFinalUpdate;

        }

    }



}

Trigger:

trigger Parent_Subtract_Trigger on Account (before insert) {

    List<Account> acct = new List<Account>();

    if(Trigger.isUpdate){

        for(Account acc: Trigger.New){



            Account oldName = Trigger.oldMap.get(acc.Parent_Account__c);

            String oldParentName = oldName.Name ;

            String newParentName = acc.Parent_Account__c;



                if(Trigger.oldmap.get(acc.Id).Name != Trigger.newmap.get(acc.Parent_Account__c).name){

                    Parent_Subtract.executeSub(acct);

            }

        }

    }

}

Am I on the right track with this functionality and does anyone know why I am recieving this message?

You're calling a method with a single Account parameter:

Parent_Subtract.executeSub(acct);

but this method is defined to take a List<Account> as its parameter:

public static void executeSub(List<Account> scope) 

This method is bulkified: it is defined to run exactly one DML operation:

update  listforFinalUpdate;

regardless of how many Account records it receives. For this reason you need to be calling it with a List<Account>, not calling it repeatedly in a loop. Your trigger should accumulate a List<Account> inside your for loop, and then make a single call to executeSub() outside the loop.