Data exporting is a standard feature available in any list view. To use it, we must first pick the rows to export by selecting the corresponding checkboxes on the far left, and then select the Export option from the Action button at the top of the list:
We can also tick the checkbox in the header of the column. It will check all the records at once, and will export all the records that match the current search criteria.
In previous Odoo versions, only the records seen on the screen (the current page) would actually be exported. In Odoo 9, this was changed, so a ticked checkbox in the header will export all records that match ...