If you are driving, you can temporarily park at main entrance at CR (off to the side), one time a valet asked to keep our key while going to the check in counter. The valet did not move the car. There are no separate check in lines for BLT, but they did have an online check in line. (We couldn't find check in parking.)
If you want Bell Services to take your luggage, you do that at CR as well. When our room was ready, I went to the villa and DH drove the car over to CR and gave the luggage to Bell Services. (It would have taking us many trips to move all of our luggage and groceries into the villa on our own.) Bell services called me in the room to confirm I was there and said they'd be coming right away. DH returned to the room after parking the car back at BLT. And within seconds after DH's arrival Bell Services arrived.