I'm not sure about the workflow of Nastran, because I've never used that. But if connecting parts by bolts, and you're looking to efficient ways in doing this, I highly recommend this Ansys Innovation Course on modelling bolt connections:
Connecting Bolts with the Rest of an Assembly | Ansys Courses
After course completion, you'll be familiar with connecting bolts as solid and line bodies. Let us know if doesn't help your case.
If you are not able to open the links, refer to this forum discussion: How to access the ANSYS Online Help
For more exciting courses and certifications, hit this link: Ansys Innovation Courses | Ansys Innovation Space
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