Unless you have purchased Advanced Warehousing as part of your Jim2 licence, you can add as many bins as you wish. However, you can only store a stock code in one bin.
For example, you can store stock code BOX in bin 1.1.1.1 but you cannot store more of that stock code in bin 1.1.1.2.
On the ribbon, go to Tools > Setups > Stock > Stock Bins.
Stock bins are a specific place where your stock is stored in each stock location, and this is where you set them up.
Further information: