You will need two people for this - player 1 and player 2.

Player 1 will have any crafting ingredients. This only works on items you can craft.

Let's say player 1 has a diamond block. Player 2 has nothing.

Player two opens a crafting table and goes to the diamond section and waits on thediamond.

Player 1 goes into a different crafting table and opens into the diamond section.

Player 2 can now craft the 9 diamonds from nothing.

You can repeat this by having player 1 press LB then RB.

Have fun making your favorite items!