If you are looking to use batch numbering in AX then you will need to consider what process you need to enable for your business. Below are four variations on setting up and item to enable for different processes either using manual batch numbering or automatic. As well you will need to determine if you are going to use the new warehouse module in R3 or you are doing simple sales order type picking and shipping.
Here are links to four variations for the setup:
Setting up an item for manual batch numbering – non wms
Setting up an item for auto batch numbering – non wms
Setting up an item for manual batch numbering – wms
Setting up an item for auto batch numbering – wms