PTC FlexPLM Fundamentals > Line Sheet Management > Working with Primary Materials > Administering Primary Materials
  
Administering Primary Materials
The primary material functionality is automatically enabled when you install PTC FlexPLM. The behaviors are controlled by the com.lcs.wc.specification.usePrimarySpec, com.lcs.wc.specification.usePrimaryBOM, and com.lcs.wc.flexbom.PrimaryMaterialGroup=PrimaryMaterial properties.
If your use of PTC FlexPLM does not require primary material functionality, it can be turned off in the custom.lcs.properties file.
1. Open the custom.lcs.properties file.
2. Add the property com.lcs.wc.specification.usePrimarySpec=false.
3. Add the property com.lcs.wc.specification.usePrimaryBOM=false.
4. Save the changes.
* 
You must have system administrator privileges to make this change.
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To enable the primary material functionality after you have disabled it, change the property values to true.
When the property is enabled, there are two visible effects in the PTC FlexPLM product interface:
The product specification page shows a Primary indicator on one of the specification headings when a season is selected.
A specification displays a Primary indicator for a BOM in the components table.