I want to create delivery from a selection of order lines, but I can\'t get the button to appear.
compose_delivery_order/
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You need take care of below things while adding new menu on More menu.
Try with below code (add code on .xml file):
Create Delivery
sale.order.line
Create Delivery
ir.actions.act_window
sale.order.line
form
form
new
True
Create Delivery
client_action_multi
action
sale.order.line