Hi,
Refer to this forums it shows how to add Dynamic Value in selection field
https://www.odoo.com/forum/help-1/how-to-create-dynamic-selection-field-fields-selection-99421

https://www.odoo.com/forum/help-1/how-to-create-dynamic-domain-on-many2one-fields-with-onchange-function-30742

Hope it helps you

Hi, 

You can follow following link for this:

https://youtu.be/GPhgxxwprA4

Hope it helps,

Thanks

If he used in the xml view the widget

widget="selection"

then the field would appear same as a selection field even if it comes from a table or a collected items via a function field, and the user then can use domains to change values dynamically

Hi , 

You can not create dynamic selection field because values are loaded at form load and can`t be changed but you can create many2one (with create=False) field and use domain to change values dynamically.