You can use the SolidNetWork License Manager to distribute licenses for SolidWorks core add-in products (such as FeatureWorks, Workgroup PDM Server, and so on).

• An equal number of SolidWorks software licenses and SolidWorks add-in licenses is not required.
• To check out a license for an add-in product, you first must check out a license for SolidWorks.
• To borrow an add-in product license, you must borrow both the SolidWorks software license and the SolidWorks product license that includes the add-in. For example, you might have to borrow either a SolidWorks Professional or SolidWorks Premium product license.
• To release an add-in product license:
  
  • In SolidWorks, click Tools > Add-ins and clear the add-in.
  • Exit SolidWorks.