question

The standard to fill items on pallet has described @Regan Blackett in creating Part on Pallet. You want to create 5 pallets with boxes on them, then you repeat the two create object activities in a loop structure. The easiest structure for this is to run a sub flow. [I have put this link just for reference here, but please follow my answer first]. You remove the two create object activities from the main process. Or if you don’t have them yet, you drag them into your process flow sheet. You drag a run sub flow activity in your main process. You click on the red circle exclamation point next to the run sub flow activity and drag the blue line into white area of the sheet. A Start activity occurs. Under the start activity you place both create object activities. You drag a finish activity under both. You should have a block of 4 activities.
Now you edit the run sub flow activity. There is a Quantity field. Here you tell the sub flow how often a token will be created in this connected sub flow for repeated execution. In your case is it 5 times.