you can bread stacked sheep etc. (wit a number and a x over there heads) but the babys will stack too and when grown up add to the adult stacked animal

How do I use the command to set up Party Itemsharing I am the leader of a Level 9 Party and see the comman in game but can't realy read it bacause I don't know half the things it is asking me to set in. Could someone give me an example Thanks