The ClickWith node is similar to the Drag To Scene node, but instead of dragging, you click the inventory grid item to pick up the item and click the highlighted spot in the scene to put it down.
Drag an Inventory Grid Item from the scene hierarchy to the storyboarder and dereference a ClickWith node.
Drag the scene model your grid item represents from the scene hierarchy into the empty parameter slot.
Now when you attach this node to the flow of execution you will be able to click the inventory grid item in the inventory grid and your cursor will become that item which you can then place in the highlighted position.
Next: Move To Inventory