How do I convert a CAD file to BIM?

How would one go about converting a CAD file to BIM? Is there a specific software or process that is typically used for this task? Are there any challenges that one might encounter when attempting to convert a CAD file to BIM, and if so, how can they be overcome? Is it possible to automate the conversion process, or does it require manual intervention? Additionally, what are some of the benefits of converting a CAD file to BIM, and how can it improve the design and construction process?