Hi there,
I would like to create a multi-cross strategy but in visual j, when I tested, it runs on a single cross, can you help me?

Hi,

VJF historical tester cannot support multi-currency testing but this is not blocking for building multi-currencies strategy as you can still export and test your strategy in Jforex platform and select the needed currency pairs applied to your test.

Cheers

Thank you sincerely for your quick response, so I can build my multicurrency strategy, test it in the platform (one pair at a time) and then fill it in java which will run in real mode on multiple pairs simultaneously? it's correct? It would be perfect!!

That's correct.
If your strategy is not cross-currency dependent like IF a condition is verified on currency X you trade currency Y then you can also do separate strategies and run them separately each one dedicated to a currency pair.