Not sure what version you are running but this is how I got to do it on my current version
1. Put Camera#/first camera angle clips on a sequence
2. Right click sequence icon on project window
3. click new sequence from clip
5. Name new sequence Camera #_
4. Do this for all camera angles
5. Make new bin and put all new sequences (named Camera #_) in it
6. Make sure it is in alpha/numerical order
7. Highlight them
8. Clip > Create Multi-camera source sequence