Stock Types may be used to define different types of developments i.e. a commercial site within a commercial precinct, or differing sizes of land, e.g. High-density allotments, average or large allotments. They are also used for subtotalling land and as selection criteria on the stock report. They are usually used within a Stock Category e.g. the Category may be Residential, and the Type Large Block. However, your Stock Types are not limited to residing within a particular category, they may be used across all categories.
Stock types form an essential part of your integration with the General Ledger (via Cost Centres). For instance in your General Ledger and Development Ledger reporting you may want to see profit and trading reports by different types of stock, and you will certainly want to see these figures by the type of land usage, for instance Town House land as opposed to standard land. The stock types give you the ability to define this integration.