Hi,

In Odoo, if you want to show data from another model (like inventory) in your addon's list view, you don’t need a selection field—you should instead use a related field or a Many2one relation.

Example:

from odoo import models, fields

class MyModel(models.Model):

    _name = "my.model"

    _description = "My Custom Model"

    product_id = fields.Many2one("product.product", string="Product")

This code defines a new custom model in Odoo called my.model. Inside it, you added a field named product_id, which is a Many2one relation to the product.product model (the standard Odoo model for products). That means in your model, each record can be linked to one specific product, and in the form or list views, Odoo will show it as a dropdown/searchable field with all available products. The string="Product" part is just the label that will be shown to users in the UI.

Hope it helps.

You need to create a new field on the model you are listing. Then you can use that field on the list view.

The new fields needs to be computed, see the documentation here:
https://www.odoo.com/documentation/15.0/developer/tutorials/getting_started/09_compute_onchange.html