So with a lct can i process brass in one session and load in another?
Yes you could but there would be some wasted motion.
First, you would have to pull the unused dies from the die turret that are not used in the operation you are doing. If you get lock rings that clamp to the die, your die setting will not change when you remove or replace the die so it is not really an issue. Or you could buy a second die turret and populate one with the sizing dies and the other with the reloading dies.
But, for each case you would have to pull the handle a couple of times after completing your operation to get the turret rotated around to be ready for the next case.
With the LCT, if I wanted to separate sizing from loading, I'd probably disable the auto index feature and use the press just like a single stage.
With a progressive, even though you'd have have some stations without dies, the shell plate just rotates through those stations with no action to the case. You are still putting a case in at station one and the planned operations to a case happens at every pull of the handle so no effort is wasted.
Most progressives use some kind of die plate for the dies so, you'd have to buy a second die plate or pull and replace dies. The Hornady L-N-L uses bushings so dies are installed in the press one at a time at each use. So, you can place dies you want where you want them at each set up. The bushings keep the die setting.
Of course, some folks will say if you do not load from fired case to loaded round on a progressive you are wasting the features of the machine. Your determination of return on investment and return on time will ultimately factor into that decision.