Hey all,
This ay be very simple but I made a stone leaf that I want to have copied along a curve I made, but i want to use the poly extrude to control the width of it,is there a way to create a stamp input for the extrusion so each leaf would be effected differently ?

Sure, drop down an attribute wrangle on the right input of the copy stamp node. Create a random value like so…
Include the variable rnd_extrude in the attributes field of the copy stamp node. Then in the polyextrude node that you have placed on the left input of the copy stamp node add the stamp command.