The Product Details Layout is a great place to display additional information about your products. This information can be stored in any of the 20 UDF fields available for each product. The easiest way to update the values in the udf fields is by using the Product Template file.
To modify the Product Details Layout, once inside of B2B Direct admin, on the left side choose Settings and then the Product Settings tab. Notice the accordion for "Product Details Layout" for authenticated and unauthenticated users.
When adding udfs to the template it is important to note that UDF1-UDF5 are to be written in uppercase and all the rest (udf6-udf20 )are to be written in lowercase. In the below example, you will see the last two lines using UDFs correctly.