Hi,
"Is there any solution to know the position or sequence of each pallet in the bulk bin which can be used to determine which pallet is the right one to pick?"
No. Because that is not what the bulk strategy is meant for. The system has no knowledge about the physical position of one pallet in the bulk.
"As it is a 6 deep, 2 wide, 4 hight bin, sometime we will have a issue for forklift driver to move out the pallets on the front to get the one on the end, it is a waste and lack of efficiency"
Yes, it is. Because in the bulk strategy it does not make sense to have to forklift driver pick a specific bin. Again, this it not what it is build for.
You should keep in a bulk bin only one material / batch, and keep this kind of material with different batches you have there in separate bins.
Brgds
Juergen