Within the NBS Plugin for Autodesk Revit, you have the ability to access features that allow you to link your Revit model and NBS Specification files.
Enabling Specification Features
To access these features, first ensure you have the plugin correctly installed then select the NBS tab within Autodesk Revit.
Click the "Activate" option and choose which NBS product/platform you are currently using.
Disabling specification features
Once enabled your NBS Plugin bar will have more options, such as below. To disable Specification Features, click on the NBS icon and click on 'Deactivate'