on odoo 13 I have set up shared products in a multi company environment.

When i import or create a shared product (no company set), I have to set the customer tax for each company on the product manually  - that is, go into the product, then change company and then select the tax. Then repeat this for the next product/company.

I can export and import and update the tax field, however this needs to be done whilst being "in" the company you wish to update. You cant just update 5 companies all at once. 

Do you think its possible to create a  default (user defined default or system parameters)   that creates the default tax code for all companies when ever a product is created (or better yet, imported)