How to send/receive multiple usb packets using the vendor USB sample code (swchoi)

I have the PIC32 USB STARTER KIT III (PIC32MX470F512L) and using Harmony 2.06's vendor USB sample,I put in my own custom commands and everything works fine for everything that's 1 packet size of less (64 bytes).I use winUSB.dll to write my own custom test..