My manager wants me to , whenever possible to always place the CAD to be machine in some type of workholding or fixture. My question is… Why?? Its time consuming.
Is it for a single object or many
Single parts for a couple.
If I am understanding your question, your manager wants you to add the fixture to your CAD/CAM model. Several things come to mind. 1) it is part of their engineering manual, all part files that have CAM would include fixturing so future runs by other personnel would be able to visualize the project, 2) using embedded fixtures (even vises) should flag any collisions or out of travel occurrences. It should not be that time consuming, even if you are using soft jaws. You can keep a model(template) of vises, fixturing, etc. and easily add and then place model in appropriate location.
Like Stephen said, can you have a standard/template to work off. Im sure you could have a save file of just the vise and load in your model, do you cam and save with a different file name and not overwrite your template.