Hi Ron,
I think it means that you can only assign materials to the bolts that are in the model. If the model only contains one material, then the drop-down list may not be enabled. (Or if the drop-down does expand, it only lists the one item.)
What you want to do is this:
- Expand the "Model" branch of the browser.
- Right-click on "Materials > New".
- Choose a material you want to have available.
- Repeat steps 2 and 3 for each material you want.
- Edit or create a bolt. The Materials drop-down will list all of the materials that are added to the model.
John Holtz, P.E. Global Product Support
Autodesk, Inc. If not provided already, be sure to indicate the version of Inventor Nastran you are using!"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉