No need to create an entire new thread. You could have edited your post in your old thread, or just posted a reply to Cin's answer.
http://www.silkroadforums.com/viewtopic.php?t=47886
However, to answer your question, you're not making much sense. If you're talking about your Weapon / Force Skills being at L17, and you deleveled down to 16, could you still use those skills? Yes, you could. I've seen a L22 using Heaven Chain, because he deleveled all the way down.
If you're talking about Stat Points, you receive 3 each time you level, as well as the 2 that are automatically distributed into INT and STR for you. You keep the 3 if you delevel, but you lose the 2. Make sense?
