Hi,

To hide some field in Many2one Here is an example

There are two fields source_location_id and destination_location_id, both of which are Many2one fields referencing the res.country model.

source_location_id = fields.Many2one('res.country',string='Source Location')
destination_location_id = fields.Many2one('res.country',string='Destination Location', domain="[('id', '!=', ""source_location_id)]")

The destination_location_id field has a domain set on it, which filters out the value of the source_location_id field from the dropdown list of destination_location_id. This ensures that the user cannot select the same country as both the source and destination

Regards