question

There are two events that can evaluate that there are more items by split mode:

1. Send to Port
2. On Exit

if you want to divert items an On Exit event is to late. You have to do it in function "Send To Port" in Output Properties pane.

Unfortunately there aren't any templates that allows you to manipulate labels. You have to write a source code script to assign label values right behind the header of this function source code.

AND you have to choose before you add this code your template, otherwise selecting a new template destroys any previously entered code.

AND this function gets executed for each leaving item once. This means after a first item has left this object any code will evaluate all staying items again. This said there are two scenarios in relation of counted item as staying inside of this object. Items are exiting instantly or items are waiting inside of object because they are transported or are blocked by next object entrance allowance.

forobjecttreeunder(current){ // recursively look for each object subnode at start node
a.Type = a.cnt; // "a" is found object of step 
a.cnt +=1; // intermediate count label at item, can be destroyed on exit
}
item.color = Color.byNumber(item.Type); 

cnt label at item must be initialized on Entry with value of 1.

code to destroy label "cnt on exit:

item.attrs.labels.subnodes["cnt"].destroy();