Hello Obx,

It is possible to add action in Top Menu.

Try this:-

<act_window id="unique_id" multi="True" name="string_name" res_model="wizard.name" src_model="sale.order" view_mode="form" target="new" view_type="form"/>

res_model :- Wizard name which is open from your action.

src_model :- Model name where your menu was displayed.

Hope this will helps you.

Thanks,