You can exclude the projects from scanning by setting them not to build from the solution configuration.
For example, one way to accomplish this is:
- Build -> clean solution
- Highlight solution, right click and select Properties
- Select configuration properties (ensure configuration is set to debug)
- uncheck the build column of each project you do not wish to scan
Now when you scan in debug mode, you will not be translating/scanning the projects that are not set to build in that configuration.
Hope this helps.