diff --git a/addons/cetmix_tower_server/models/cx_tower_os.py b/addons/cetmix_tower_server/models/cx_tower_os.py
new file mode 100644
index 0000000..f98dc4c
--- /dev/null
+++ b/addons/cetmix_tower_server/models/cx_tower_os.py
@@ -0,0 +1,17 @@
+# Copyright (C) 2022 Cetmix OÜ
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from odoo import fields, models
+
+
+class CxTowerOs(models.Model):
+    """Operating System"""
+
+    _name = "cx.tower.os"
+    _inherit = [
+        "cx.tower.reference.mixin",
+    ]
+    _description = "Cetmix Tower Operating System"
+    _order = "name"
+
+    color = fields.Integer(help="For better visualization in views")
+    parent_id = fields.Many2one(string="Previous Version", comodel_name="cx.tower.os")