odoo-server-addons/user_portal_internal/views/res_users.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="user_to_portal_action_server" model="ir.actions.server">
    <field name="name">Set user to portal</field>
    <field name="model_id" ref="base.model_res_users" />
    <field name="binding_model_id" ref="base.model_res_users" />
    <field name="groups_id" eval="[(6, 0, [ref('base.group_erp_manager')])]" />
    <field name="state">code</field>
    <field name="code">records.write({'groups_id': [(6, 0, [env.ref('base.group_portal').id])]})</field>
  </record>

  <record id="user_to_internal_action_server" model="ir.actions.server">
    <field name="name">Set user to internal</field>
    <field name="model_id" ref="base.model_res_users" />
    <field name="binding_model_id" ref="base.model_res_users" />
    <field name="groups_id" eval="[(6, 0, [ref('base.group_erp_manager')])]" />
    <field name="state">code</field>
    <field name="code">records.write({'groups_id': [(6, 0, [env.ref('base.group_user').id])]})</field>
  </record>

</odoo>