Hello everyone,
I am new to this world of odoo and I would like to know what is the best way to pass all the data that I have in my odoo 8 to my other odoo 14 already installed and everything. I only want to pass the information of clients, purchase orders, sales orders, purchase invoices, categories, rates, products, etc.

I have seen that there are 3 ways to do it:
- Exporting and importing with excel. (doing it this way is more intuitive, but there is the problem that you have to extract models one by one and some fields such as country, currency, etc., cause problems when not finding that record in the new version, which should to be exported I also understand)
- Import script that collects the data from odoo 8 and injects it into odoo 14 (I have not found any tutorial that explains or gives examples of how to access the data or create records in the destination database)
- With openupgrade (problem that I can only go from version to version, I can't do it directly from v8 to v14)

I hope someone can help me out of this hole.

Greetings and thank you