Hi,
it will be possible in the next version, with a macro that allow a table lookup.
I've already done a customization to some users with this macro, so if you can't wait I could add this to your version. I need to know which version are you using and more details on the table lookup query you need. The reason is the macro should return exactly what you need, while in the next release there will be "placeholders" so you will be able to build any result step-by-step.
If you prefer, send me a mail at info(at)sistemistica.it or info(at)selfget.com (we are moving on a new site).
Best regards,
Luigi