# Item Grouping # Updated: 30.07.2019 > [HTML Version](item_grouping.htm) With the help of the item groups you can structure your items and filter item lists for a better overview. When you create item groups, check carefully which criteria you use to structure your item stock, because later changes to item groups often require laborious reworking of the individual items that are affected by the change to the item groups. The example provided in the basic installation shows, for example, how to structure watches. The level of structuring depends entirely on your needs. For the item numbers, **eXtra4winIII** recommends a structuring of the items with up to four levels. **1. Level** Describes the so-called main group of items, which could be structured as follows as an example: 1 = Clocks 2 = Rings 3 = Chains 4 = Brooches 5 = Ear jewellery 6 = Arm jewellery etc. Depending on the product orientation of your business, other main groups can also be formed accordingly. **2. Level** Is the first subgroup of the main groups and could look like this 11 = Watches - Men 12 = Watches - Ladies 13 = Watches - Children 14 = Watches - Alarm clocks 15 = Watches - large watches etc. **3. Level** Subdivides a further level which could be structured as follows 111 = Watches - Men - Manual winding 112 = Watches - Men - Automatic 113 = Watches - Men - Quartz etc. **4. Level** The last outline level again as an example 1111 = Watches - Men - Manual winding - Leather bracelet 1112 = Watches - Men - Manual winding - Steel bracelet 1113 = Watches - Men - Manual winding - Titanium bracelet etc. The classification presented here is only indicative and therefore not mandatory. You can always bring in your own ideas of structuring here. **Important note** Take your time to structure the product groups\! Subsequent reorganizations of the goods classification are usually associated with considerable expenditure of time and cause great confusion. ** **