Hi,

Suppose if you need to call the action of the product menu in your module, what you have to do is that, take the external ID of the corresponding action and specify it in your new menu.

<menuitem id="menu_product_template_form"
          parent="id_of_your_parent"
          action="product.product_template_action"
          sequence="30"/>

This is a new menu in custom module, that calls the product_template_action in product module.

Thanks

You need to pass action ='Main_Module_name.external_id' in your menu item 

Example: action="product.product_action_ID"

in your button name="%(Main_Module_name.external_id)d"

name="product.product_action_ID" type="action"

or

name="product.product_method_name" type="object"

Thanks !