As we discussed in the **Item** section, if an **Item** is *serialized*, a **Serial Number** (Serial No) record is maintained for each quantity of that **Item**. This information is helpful in tracking the location of the Serial No, its warranty and end-of-life (expiry) information.
**Serial Nos** are also useful to maintain fixed assets. **Maintenance Schedules** can also be created against serial numbers for planning and scheduling maintenance activity for these assets (if they require maintenance).
You can also track from which **Supplier** you purchased the **Serial No** and to which **Customer** you have sold it. The **Serial No** status will tell you its current inventory status.
If your Item is *serialized* you will have to enter the Serial Nos in the related column with each Serial No in a new line.
### Importing and Updating Serial Nos
Serial Nos cannot be imported from Stock Reconciliation. To import Serial Nos, you will have to use the Data Import Tool. When you import the Serial Nos, the stock level of its corresponding Item will be automatically updated.
### Using Serial Numbers for Multiple Purposes
Serial Nos are a useful tool for tracking different kinds of Items, by using it along with Custom Fields. For example, in our internal system at Web Notes, each ERP account is a Serial No, with type of user “Plan” as the Item, its expiry date, whether it is Trial or Paid and other details as Custom Fields.
