Thank you for the tutorial, @mcrudd. I already had my Sim trained and he was in a household that wasn't played. So I skipped a few steps, evicted him (& the whole household). When I went to my restaurant's hiring employee choices--he was there. Like you said, though, he was only offered as a waitress or host position. After that, I did your next step--I went into the unplayed households catalog, and then deleted the majority of my unplayed Sims. (I even deleted the NPC's that were already hired as my hostesses & waitresses...oops!) It still turned out though. When I went back into my restaurant's hiring choices screen--my Sim was there still, but NOW offered as a Chef! Yay!!!! I was able to hire him as my 2nd chef--though he did lose all of his training & had to start over from the bottom. :( Also, as I had deleted all of my NPC's already hired, I had to repick new ones & start the training of them over again. So, some of this worked out, and a little didn't. I was able to follow your steps very easily. Thank you again! Much appreciated! :)
