I’m not sure what, if anything, is actually different for the “Jcurve version” (after a very brief google search, I suspect that that nothing is different, and Jcurve is just your implementation partner). Regardless, you should be able to export, by creating a saved search on the Transaction record type, and then filtering the criteria to Type = Purchase Order (and whatever other criteria you need).  You can then export this to excel or csv via the appropriate buttons after running it. Check out “Defining a Saved Search” SuiteAnswer ID 8474 and the other linked SuiteAnswer articles on that page if you’re unfamiliar with saved searches.

Further to James’ answer which is very helpful, JCurve is a limited version of NetSuite but you should be able to do what James is suggesting.