Render all of your videos in Vegas to a Bluray compatible format. Then use DVDA to author the Bluray with your videos, chapters, menus etc. There are many videos online about how to use DVDA.
Thank you DMT3... I thought it would be that easy...but I have DVDA Build 84 (version 7?) and it doesn't have the Make a Blu-ray disk option...is there a later version still available for download...?
The above listed link also contains a link to DVDA 7's user manual - but you should already have the user manual with build 84 (available from the Help menu in DVDA 7). Page 106 should be the page which outlines how to set project properties for a DVD or BD project.
@Paul-Crawford It should but it only appears when your project is set to Blu-ray disc. Go to File/ Properties and in Project Properties select Blu-ray Disc