Скрипт для ПБК: получаем словарь MeterPoint.Caption и результат разбивки строки на части с помощью разделителя слеш.

MP_split_by_slash.cs

using ObjStudioClasses;
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Threading.Tasks;
using GemBox.Spreadsheet;
using System.Text.RegularExpressions;

public class Script
{
    public static object Execute()
    {
        var meterPoints = MeterPoint.GetInstances().ToHashSet();
        Dictionary<MeterPoint, string[]> dictionary = new Dictionary<MeterPoint, string[]>();
        using (var sw = new StreamWriter(@"C:\Users\GShilov\Documents\pbk.csv", false, Encoding.UTF8))
        {
        int i = 0;
        foreach(var meterPoint in meterPoints)
        {
	        string[] mp_name = Regex.Split(meterPoint.Caption, @"\\");
	        dictionary.Add(meterPoint, mp_name);
	        
	         switch (mp_name.Length)
             {
             case  1:
                 sw.WriteLine((i+1).ToString() +";"+ meterPoint.Caption  +";"+  mp_name[0]  +";" );
                 break;
             case  2:
                 sw.WriteLine((i+1).ToString() +";"+ meterPoint.Caption  +";"+  mp_name[0]  +";"+  mp_name[1]  +";" );
                 break;  
             case  3:
                 sw.WriteLine((i+1).ToString() +";"+ meterPoint.Caption  +";"+  mp_name[0]  +";"+  mp_name[1]  +";"+  mp_name[2]  +";" );
                 break;
             } // end switch
        
            i=i+1;
        }
        } // end using 
        return dictionary;
    }
}