Hello world! 

I would like to add a button in more button list, I´ve tried this:

<!-- Add new option in to More menu -->
       <act_window id="action_name" multi="True" key2="client_action_multi" name="Export Excel" res_model="import.order" src_model="import.order" view_mode="tree" target="new" view_type="tree" />

This action shows a Tree view from the recors but I want to Export to Excel the selected records in the tree view.

Regards! Thank you!