...
2. Next go to Warehouse > Master Data > Items and create a new item.
3. Create an item as usual, pick Set on the Main Parameters tab and save it.
4. As an item saved, click the Specifications link and add a new specification.
5. After specification adding, create sales documents (Customer Order and Invoice) as usual and mention required specification in corresponding column.
6. The system writes off components by selected specification from the warehouse:
Thank you for being a FirstBIT customer!
...