Hi Pierre,

I hope you are well today and thank you for your question.

You can try using following solutions to batch create them or develop custom code to achieve this.

https://wordpress.org/plugins/bulkpress/

http://wordpress.stackexchange.com/questions/182389/best-practice-for-adding-posts-in-bulk

Developing custom code for custom functionality is beyond the scope of support that we provide here. Please see https://themeforest.net/item/jevelin-multipurpose-premium-responsive-wordpress-theme/14728833/support

If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5

Best regards,
Shufflehound team