Hi @Mohamed2335,
If the user link with an employee then please apply it.
{% if doc.custom_quotation_created_by %}
{% set user_id = frappe.db.get_value("User", doc.custom_quotation_created_by, 'name') %}
{% if user_id %}
{% set designation = frappe.db.get_value("Employee", {"user_id": user_id}, 'designation') %}
{% if designation %}
{{ designation }}
{% endif %}
{% endif %}
{% endif %}