please try ,

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

    <field name="name">Channel Search</field>

    <field name="model">Your one2many model</field>

    <field name="arch" type="xml">

    <search>

       <group expand="0" name="group_by" string="Group By">

            <filter name="field name" string="string" domain ="[('xxx','yy',zz)]" context="{'group_by':'field name'}" />

        </group>

    </search> 

    </field>

</record>

You mean you have to arrange the fields of one2many ?. Then you should give a view to the one2many object. Then in xml file, give the record id into form_view_ref as context. I think this is the solution (Question is not descriptive, If you clear the question, It may helpfull)

Something like this:

<field name="one2many_ids">

     <tree>

         <field name="field1"/>

         <field name="field2"/>

    </tree>

</field>

I want to use group by in tree view but I don't know how