hello wizardz,

You have inherit the existing view using xpath and add possition as attributes and give the group to that field.

for example here group is give on button likeweise you can give it to your field.

<record model="ir.ui.view" id="invoice_form_inherit">           

        <field name="name">invoice_form inherit</field>           

        <field name="model">account.invoice</field>           

        <field name="inherit_id" ref="account.invoice_form"/>           

        <field name="arch" type="xml">                               

        <xpath expr="//form/header/button[@name='invoice_print']" position="attributes">                   

                        <attribute name="groups">base.group_system</attribute>       

        </xpath>           

        </field>       

</record>