Indeed you can.
Just threw together a really rough actor made of stacking boxes:
First two blocks of logic are events in the level sequence. The spaghetti monster at the bottom is the actor’s function to add more boxes.
This function is also called in construction script, so non-sequenced actors can have the height changed in the editor by tweaking the public var.
(To remove boxes from stack would just need to loop the other way off that first branch.)