Hi Hamza,

For Inherit account view, follow below code sample :

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

            <field name="name">inherit.invoice.form.view</field>

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

            if inherit customer invoice then inherit_id account.invoice_form

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

            if inherit supplier invoice then inherit_id account.invoice_supplier_form

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

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

             <xpath expr="//field[@name='existing_field_name']" position="after">

              <field name="your_field_name"

             </xpath>

            </field>

        </record>

I hope this helps you.

Thanks!