diff --git a/addons/cetmix_tower_server/models/cx_tower_variable_mixin.py b/addons/cetmix_tower_server/models/cx_tower_variable_mixin.py
new file mode 100644
index 0000000..382aae2
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+++ b/addons/cetmix_tower_server/models/cx_tower_variable_mixin.py
@@ -0,0 +1,82 @@
+# Copyright (C) 2022 Cetmix OÜ
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from odoo import _, fields, models
+from odoo.exceptions import ValidationError
+
+
+class TowerVariableMixin(models.AbstractModel):
+    """Used to implement variables and variable values.
+    Inherit in your model if you want to use variables in it.
+    """
+
+    _name = "cx.tower.variable.mixin"
+    _description = "Tower Variables mixin"
+
+    variable_value_ids = fields.One2many(
+        string="Variable Values",
+        comodel_name="cx.tower.variable.value",
+        auto_join=True,
+        help="Variable values for selected record",
+    )
+
+    def get_variable_value(self, variable_reference, no_fallback=False):
+        """Get the value of a variable.
+        IMPORTANT: This is the generic method that returns the value of the variable
+        for the current record.
+        It doesn't evaluate fallback values,eg "jet->template->server->global".
+        Inherit and override this method to implement a proper value parsing logic.
+
+        Args:
+            variable_reference (str): The reference of the variable to get the value for
+            no_fallback (bool): If True, return current record value
+                without checking fallback values.
+        Returns:
+            str: The value of the variable for the current record or None
+        """
+        self.ensure_one()
+
+        # Get the variable value for the current record
+        variable_value = self.variable_value_ids.filtered(
+            lambda v: v.variable_reference == variable_reference
+        )
+        if variable_value:
+            return variable_value.value_char
+
+    def set_variable_value(self, variable_reference, value):
+        """Set the value of a variable.
+
+        Args:
+            variable_reference (str): The reference of the variable to set the value for
+            value (str): The value to set for the variable
+        """
+        self.ensure_one()
+
+        # Check if the variable value exists and update it
+        variable_value = self.variable_value_ids.filtered(
+            lambda v: v.variable_reference == variable_reference
+        )
+        if variable_value:
+            # Do nothing if the value is the same
+            if variable_value.value_char == value:
+                return
+            variable_value.value_char = value
+            return
+
+        # Get the variable
+        variable = self.env["cx.tower.variable"].get_by_reference(variable_reference)
+        if not variable:
+            raise ValidationError(
+                _(
+                    "Variable '%(variable_reference)s' not found",
+                    variable_reference=variable_reference,
+                )
+            )
+
+        # Create a new variable value
+        self.write(
+            {
+                "variable_value_ids": [
+                    (0, 0, {"variable_id": variable.id, "value_char": value})
+                ]
+            }
+        )