You can leverage our "multi edit" feature when working with records in List View:

1. Check that the Tags field is visible

2. Select ALL of the records you want to update

3. Click OK to confirm the update

Extra Credit:  You can also use Filters if you have specific criteria to identify records so you can update even more with a single edit that updates all of them at once.

Hi Patricia,

You can add onchange on the field category_id ( Tags ). If it's parent then apply same tags to childs

your code should look something like this:

@api.onchange('category_id')
def onchangge_contact_categ_id(self):
       if self.category_id and not self.parent_id:                 self.child_ids.mapped('category_id') = [Command.set(self.category_id.ids)]

Of course, since you may have different childs types ( invoice contact, delivery_contact...) and you want to apply this to only a specific type, then you have to call filtered before calling mapped.

I hope it's clear.