Serial tracked products can have their costs tracked in one of two ways. The first is the same way the other products are tracked, either average or latest cost, and the second is to track the costs individually for each serial number.
To enable tracking costs by serial number, open the Settings module and navigate to Product Settings. Choose Edit to enable the ability to make changes. Locate the setting Track costs by serial number in the pricing section and use the toggle to enable it.

With this setting enabled, the transaction costs for each serial number in a product are tracked separately, with each serial number tracking its own costs.
Viewing the product costs
With track costs by serial number enabled, the product enquiry changes the serial numbers tab slightly.

Infusion will display each serial number of a product in the Serial Numbers tab, and show the costs associated with that serial number. These costs come from the corresponding transaction for that serial number and cannot be changed.
Editing the latest costs on a serial number
The latest cost of a serial number can be updated on the Serial Numbers function of the Products module. Select Edit on the line of the serial number to make changes to the costs.

When any changes are made to the costs of a serial number on this screen, remember to choose Save to keep the changes made that line. If a user chooses to edit a second line without saving the first, then all unsaved changes will be lost.

How does tracking costs individually impact transactions?
For invoices, if the costs are tracked individually on serial numbers, the cost cannot be changed on the invoice, as Infusion will use the tracked cost.

For any other transaction that would typically allow the cost to be edited, except for purchase orders and product receipt, the costs cannot be edited.
Serial tracked costs on the stocktake
When stocktaking serial tracked products, and entering the count of the on hand serial numbers, a new column showing the costs of that serial number is displayed

This cost column is a display only column and cannot have its contents changed.