question

Define the parameters (weight capacity, volume capacity as slots labels and paint them onto the floor storage (mostly so they get set to the correct value on model reset). In the slot entry and exit triggers, set those labels to be decremented/incremented by the values on the entering/exiting item to update the available capacity. (The default pick option for this doesn't work for some reason; possibly to do with using the "inc()" command. So simply use "slot.labelName ±= item.labelName" in a code snippet.

To filter for slots with enough capacity, either do the slot assignment in process flow with the "Find Slot" activity (this has to happen before the item enters the storage object) or use the "Storage.system.findSlot()" command. It uses the same SQL syntax you can have automaically generated in the "Find Slot" activity.

https://docs.flexsim.com/en/21.2/Reference/CodingInFlexSim/FlexScriptAPIReference/Warehousing/Storage.System.html#Method-findSlot

The whole code would look something like this:

Object item = "get a reference to the item, any entry/exit trigger offers this by default";
Storage.Slot slot = Storage.system.findSlot("...");
if(slot)
{
Storage.Item s_item = Storage.Item(item);
s_item.assignedSlot = slot;
}

To take the shape of the items into account as well, use the "slot.hasSpace(item)" method in your query.

slot-optimization.fsm