[Solved] How to add a button to the Action menu?

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Use key2="client_action_multi" in act_window to add submenu to “Action” button (“More” in previous Odoo versions). Reference here

<act_window name="New Sub menu"
    res_model="product.product"
    src_model="product.product"
    key2="client_action_multi" 
    view_mode="form" target="new" 
    view_type="form"
    id="act_new_sub_menu" />

solved How to add a button to the Action menu?