diff --git a/management/commands/_import_utils.py b/management/commands/_import_utils.py
index d9243a3..9563517 100644
--- a/management/commands/_import_utils.py
+++ b/management/commands/_import_utils.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
 
+import json
+
 from django.core.management.base import BaseCommand
 from collections import defaultdict
 from django.apps import apps
@@ -15,6 +17,10 @@ class ImportCommand(BaseCommand):
     Generic command for import of NK15 database
     """
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(args, kwargs)
+        self.MAP_IDBDE = dict()
+
     def print_success(self, to_print):
         return self.stdout.write(self.style.SUCCESS(to_print))
 
@@ -36,6 +42,14 @@ class ImportCommand(BaseCommand):
         parser.add_argument('-c', '--chunk', type=int, default=100, help="chunk size for bulk_create")
         return parser
 
+    def save_map(self, filename):
+        with open(filename, 'w') as fp:
+            json.dump(self.MAP_IDBDE, fp, sort_keys=True, indent=2)
+
+    def load_map(self, filename):
+        with open(filename, 'w') as fp:
+            self.MAP_IDBDE = json.load(fp)
+
 
 class BulkCreateManager(object):
     """