assign expense for job with different currency

You can only use and assign one currency per customer, job, or vendor profile in QuickBooks Desktop, NaderAbbasi.

This means that you're unable to create a transaction for USD-based customer on a JOD currency.

Also, amounts on sales and purchase transactions will be in your customer's currency. Although, the home currency equivalent is listed for the transaction total. You'll want to convert the amount to JOD before recording the transaction. 

Check out this article about the Multicurrency feature as an additional reference: Set up and use Multicurrency.

You can also run both Realized Gains and Loses and Unrealized Gains and Losses reports that can help you check amounts collected using foreign currency amounts. See the screenshot below on how you can open both reports.

I'd be glad to get back here if you need more help. The Community is always here to offer our assistance.

this will not cover my requirements as i need to assigned the expenses in JOD to a customer in USD to enable me reach to the net profit per job 

i believe i have to use the classes  instead 

thank you 

@NaderAbbasi 

Consider to send invoice in USD with this service and accept the payment in JOD

https://veem.grsm.io/veems

Hope it helps.