Hello WillowTree

class MrpWorkcenterProductivityLossType(models.Model):
    _name = "mrp.workcenter.productivity.loss.type"
    _description = 'MRP Workorder productivity losses'
    _rec_name = 'loss_type'


    loss_type = fields.Selection([
            ('availability', 'Availability'),
            ('performance', 'Performance'),
            ('quality', 'Quality'),
            ('productive', 'Productive')], string='Category', default='availability', required=True)

you can see loss_type is define in above module which is selection field with various option.

class MrpWorkcenterProductivityLoss(models.Model):
    _name = "mrp.workcenter.productivity.loss"
    _description = "Workcenter Productivity Losses"
    _order = "sequence, id"

    loss_id = fields.Many2one('mrp.workcenter.productivity.loss.type', domain=([('loss_type', 'in', ['quality', 'availability'])]), string='Category')

workcenter productivity loess has many2one of loss type module with domain as mentioned above.

Thanks & Regards,

​

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First activate developer mode then go to setting or search by model on main odoo screen and go to specific model which you want to see then open it and see all fields available ..... you can find any field that is relevant to your search model