partner-contact/crm_department/views/res_partner_view.xml

<?xml version="1.0"?>
<openerp>
    <data>

        <record model="ir.ui.view" id="view_partner_form_department">
            <field name="name">Partner form with department</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <field name="phone" position="before">
                    <field name="department"
                           placeholder="Department"/>
                </field>
            </field>
        </record>

        <!-- Uncomment this to add a new column to tree view
        <record model="ir.ui.view" id="view_partner_tree_department">
            <field name="name">Partner tree with department</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_tree"/>
            <field name="arch" type="xml">
                <field name="phone" position="before">
                    <field name="department"/>
                </field>
            </field>
        </record>
        -->

        <record model="ir.ui.view" id="view_res_partner_filter_department">
            <field name="name">Partner search with department</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_res_partner_filter"/>
            <field name="arch" type="xml">
                <field name="category_id" position="after">
                    <field name="department"/>
                </field>
                <filter string="Salesperson" position="after">
                    <filter string="Department"
                            domain="[]"
                            context="{'group_by': 'department'}"/>
                </filter>
            </field>
        </record>

    </data>
</openerp>