project_features_dental_mocona/views/project_task.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>

        <!-- form view -->

        <record id="project_task_feature_form" model="ir.ui.view">
            <field name="name">project.task.feature.form</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_form2"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook/page[@string='Extra Info']" position="after">
                    <page string="Historial" groups="base.group_user">
                        <group>
                            <group string="Modelo">
                                <field name="higher" class="oe_inline"/>
                                <field name="lower" class="oe_inline"/>
                            </group>
                            <group string="Fase (Modelos)">
                                <field name="phase_start"/>
                                <field name="phase_end"/>
                            </group>
                            <group string="Alineador (Espesores)">
                                <field name="a1" class="oe_inline"/>
                                <field name="a2" class="oe_inline"/>
                            </group>
                        </group>

                    </page>
				</xpath>
            </field>
        </record>
    </data>
</openerp>