Technically the trigger isn't bulkified (many times for cloning I don't do that anyways b/c it's triggered by button click). But, since this is a trigger, technically you should add all the opportunities that need to be cloned to a list and pass the entire list to the helper method.

I am getting error in this trigger:

Error: Compile Error: Method does not exist or incorrect signature: [Cloneopty].CloneoptywithIbxline(MAP<Id,Id>) at line 44 column 9

Please post the code how to achive this

My Class :

public class Cloneopty
{

public final String ForecastStatusIsNewActive = 'New/Active';
Map<Id, Id> OppsToCloneList = new Map<Id, Id>();
//Method to check the opportunity has Slipped IBXline
public void CloneoptywithIbxline(Id oldOppoID ,Id opportunityId)
{
List<IBX_Lines__c> ibx =[Select Name,Opportunity__c,IBX_Name__c,Forecast_Status__c,Line_Type__c,Booked_Gross_MRR__c,Booked_Gross_NRR__c,Booked_Net_MRR__c,Booked_Net_NRR__c,Forecast_NRR__c,Forecast_MRR__c from IBX_Lines__c where opportunity__c =:oldOppoID AND Forecast_Status__c='Slipped'];
List<IBX_Lines__c> ibsList = new List<IBX_Lines__c>();
system.debug ('***The ibx is***'+ ibx);
for(IBX_Lines__c ib : ibx)
{
IBX_Lines__c newline = new IBX_Lines__c ();
newline.Opportunity__c= opportunityId;
newline.IBX_Name__c = ib.IBX_Name__c;
newline.Line_Type__c = ib.Line_Type__c;
newline.Forecast_Status__c = ForecastStatusIsNewActive;
newline.Forecast_NRR__c =ib.Forecast_NRR__c;
newline.Forecast_MRR__c =ib.Forecast_MRR__c;
ibsList.add(newline);

}
insert ibsList;
system.debug('***list is****'+ ibsList);
}
}

Trigger :

trigger Eqx_CloneOpportunity on Opportunity (after insert,Before Update)
{
// Update the clone opportunity Id - This is used to determine whether to use whether Only Slipped IBX should be cloned
if(Trigger.isUpdate && Trigger.isBefore)
{
for (Opportunity opp : Trigger.New)
{
// To avoid unndessary updates, can we check and see if the clone opportunity Id has changed

if(opp.Clone_Opportunity_ID__c == null || opp.Clone_Opportunity_ID__c != opp.ID)
{
opp.Clone_Opportunity_ID__c = opp.ID;
}
}
}

if(Trigger.isInsert && Trigger.isAfter)
{
Map<Id, Id> OppsToCloneList = new Map<Id, Id>();

for (Opportunity opp : Trigger.New)
{

system.debug('OpportunityID--->'+opp.Clone_Opportunity_ID__c);
if (opp.Clone_Opportunity_ID__c != null)

//cp.CloneoptywithIbxline(opp.Clone_Opportunity_ID__c,opp.id<http://opp.id>);
OppsToCloneList.put(opp.Clone_Opportunity_ID__c,opp.id);



}
Cloneopty cp = new Cloneopty();
cp.CloneoptywithIbxline(OppsToCloneList);

}
}