Hi Hamza !

maybe you can use "dot notation" for example company.fieldname

class ResConfigSettings:
_inherit_ = 'res.config.setting'

@api.model
def get_values(self):
res = super(ResConfigSettings, self).get_values()
res['field'] = self.env['ir.config_parameter'].sudo().get_param('company.fieldname')
return res

def set_values(self):
self.env['ir.config_parameter'].sudo().set_param('company.fieldname', self.field)

super(ResConfigSettings, self).set_values()