Is there a way to link an answer from question 1, say, to question 2 if answer 1 works or enhances all or part of question 2? I see many questions that have essentially the same answer.
No, there isn't. But if you find that an existing answer to one question also applies to another question:
- Check and see if the questions are duplicates, and if so, flag one as a duplicate of the other
- Otherwise, you can quote the relevant parts of an answer (whether yours or someone else's) and include a link to it in your answer, just as you would quote the relevant parts of, and link to, an external website. (Of course make sure your answer is self-contained so that people don't have to click on the link to get the point.)