odoo-event-addons/event_question_sale_renting/models/event_question_answer.py

from odoo import api, fields, models, _


class EventQuestionAnswer(models.Model):
    _inherit = "event.question.answer"

    extra_renting_ids = fields.One2many(
        comodel_name="event.question.answer.renting",
        inverse_name="answer_id",
        string="Extra Renting",
        help="These products rentings will be added to the sale order of the booking with the given quantity, prices and duration.",
    )