[SalesForce] DML requires SObject or SObject list type: List>

How do I insert the values from the map? I want to insert the grandchildren records in variable Commlinesmap, but I get this error:

DML requires SObject or SObject list type: List>

Error is at line: insert commlinesmap.values();

public class QuotaClone {

    public static void clonequota (Quota_Stat__c  qstat) 
    {
        Map<Rep_comm__c,List<Commission_line__c>> Commlinesmap= new Map<Rep_comm__c,List<Commission_line__c>>();
        List<Rep_comm__c> newRepList = new List<Rep_comm__c>();

        //Fetch the child (Rep_comm__c) and grandchild (commission_line__c) from parent record qstat
        List<Rep_comm__c> RepList = [Select r.Vendor__c, r.Name, r.Id, (Select Name, Start_Date__c, End_Date__c, Rep__c From Commisions__r) From Rep_Comm__c r where vendor__c = :qstat.Id];

        Quota_Stat__c newqstat = qstat.clone(false, true); //do a deep clone of parent

        //insert the parent (quota stat) record
        insert newqstat;

        // clone the child records (Rep_comm__c) 
        for(Rep_comm__c rcom : RepList){
            Rep_comm__c newRepcomm = rcom.clone(false, true); //do a deep clone
            newrepcomm.vendor__c = newqstat.Id;
            newRepList.add(newRepcomm);
            //add the cloned grand child records (Commission_line__c) to map
            Commlinesmap.put(newRepcomm,rcom.Commisions__r.deepClone(false,false,false));
        }
       // insert child records (Rep_comm__c)
            insert newRepList;
          //match the grandchild records to child records
        for(Rep_comm__c rcomm :Commlinesmap.keySet()){
            for(Commission_line__c comline : Commlinesmap.get(rcomm)){
                comline.Rep__c = rcomm.Id;
            }
        }

                 //**not sure how to insert these values....**
                    insert Commlinesmap.values();

    } 
}