Based on your requirement to add subtree field in main form using related fields and add the related fields in search view.

 Refer the Link In the example given sale order line Product details added in the sale order search box using related field.

Hi,

Thanks a lot for the answer. The solution you linked is very useful and I implemented it as is (modules are very similar in structure), but I would like to search inside the form view instead of the main tree view.

Suppose that you are looking at the form and the 'line_ids' tree contains a lot of entries. Instead of looking at all the entries to find the one I want I would like to have a 'search' field (a simple text field is sufficient) so that when I type something inside this field the tree becomes 'filtered' showing only lines that are matching my search criteria.

Thanks,

Frank

Maybe these questions might help you:

https://www.odoo.com/forum/Help-1/question/show-filtered-records-in-one2many-field-using-Domain-29562

https://accounts.openerp.com/forum/Help-1/question/How-filter-x2many-6602#post-id-6605

https://www.odoo.com/forum/Help-1/question/How-to-use-dynamic-values-in-domain-filter-17289

Regards.