you can try the following:
self.env['evaluation.model'].create({'name': self.name_of_new_record})

Keep in mind in the create dictionary, you have to set all required fields for the evaluation model.

Hi, Nomad_King answered your question pertfecly. I just want to add some information. self.env['model_name'].create(list_of_dictionaries) creates new records of the model 'model_name'. 'list_of_dictionaries' is, well, a list of dictionaries. Each dictionary is a new record. It basically looks like this {'field_name1': value, 'field_name2': value, ...} You get it. Be carefull with related fields: One2many and Many2many fields use special 'commands'. Check the documentation for more info.

Thanks so much for your quick reply,

I will try it and let you know