Hello @Bassoum,

Welcome to the Community.

There isn't an option to create a journal entry to post a vendor bill using different currencies. 

Your ideas about the product are more important to us. This would help our Product Development Team know what are the things the needs improves to suit your needs. I'll let them know about these options so they can put it into consideration for future product updates.

Also, please visit our blog site to stay current on all the QuickBooks news and updates

Just in case, you can visit this article for future reference about adding a foreign-currency to your customers and vendors: Set-up and Use Multicurrency.

You can always drop by here in the Community for any questions you need help with. We're always happy to serve you.