PTC FlexPLM Fundamentals > Line Sheet Management > Working with Primary Materials > Setting a Primary BOM for a Specification
  
Setting a Primary BOM for a Specification
When creating a new product specification, product designers can associate a BOM as the primary BOM for the specification. You must have permissions to edit specification in order to set or change the primary BOM on a specification. Identifying a primary BOM for a specification allows you to view the primary material from the primary BOM in the season line sheet.
Identifying the primary BOM occurs in the following ways:
Creating a new BOM within a new specification automatically sets that BOM as primary for that specification.
Associating an existing BOM to a new specification sets the first BOM associated to the specification as primary.
When viewing a specification with associated BOMs, you can select the Set As Primary action for the BOM you want to be primary for that specification.
The primary specification for a season is identified by the word Primary on the specification page. The primary BOM is identified in the Components table by a Yes value in the Primary column of the table. A primary BOM component is not required in a specification.