Marriott will transfer the points required to order an award. Thus if you have 200K points and order a 200K award, no points will need to be transferred. If you order a 300K award and have 200K in your account, Marriott would pull 100K from the other account. If you want the full 140K transferred into your account you will need to order a 340K (assuming you have 200K in your account.)

And if you cancel the award after the transfer, all points will be transferred into your account.