Let's start with an example: you want to add tags on SO (marketing, service, or whatever)



STEP 1 (https://youtu.be/5o-UDIw78A8)

1. Create a M2M relation between SO and a new model (SO Tags)

2. Add the menu of your new model in Odoo

3. Go to this new model and add an integer number to this model



STEP 2 (https://youtu.be/xQicQmpMbuY)

4. Edit the form view of the SO

5. Go to the studio inherited view and find your M2M field and add this piece of code: options="{'color_field': 'x_studio_color', 'no_create_edit': True}"


The same can apply in the kaban view ;)

FYI the ID's colors: