You didn't tell me HOW I train BO's in my skills, you only told me for the 2nd time that it's possible.
Once you've got an appropriate skill to level 9, you can train a BO of the appropriate class via the 'train' button on the BO's status tab in the Character Status window.
Remember that your captain, the ability you're training and the BO being trained must all be of the same class, and that as far as I know the 'Mark III' abilities are all Lt Commander or Commander BO rank.
cryptic should have given everyone a space skill for their proff at level 1 so people have an idea they are different.
I had no idea until I hit lvl 9 in OB. I found out on the last day of OB that I had Alpha Strike. I didn't even check to see what my science guy had, but from reading on the forums he had a different skill.
I chose an Engineer but he is just like every other prof until I reach lvl 8.