Hahaha, when I was so boring playing my RF yesterday, I just do something to experiment.
I was shuck at my self when I do this successfully,
Ok, I will give you Hint for this, this hint is about 50% so you might get this I think. for noob, I dont know. heheh
2 Hint for you.
First Hint:
"You can only do this in HeadQuarters."
Second Hint:
"Trade"
GL :P