Post another question
In a forum, it wouldn't be kosher, but SE isn't a forum. We prefer questions (even similar ones) be separate. Just make sure that
There's something truly new to add
You link to the previous question
Why not edit the old question? Because you might invalidate the answers. That's a problem, since your answerers might not check back to ...
If the question was as broad as you make it out to be ( "How do I make this chair" ) with no details as to what you tried and research you have done, that would not be a good fit.
You could ask:
I saw this chair online, and I want to build it, but I can't seem to figure out how the slats in the back are fastened in place to give them strength. Glue only ...