Well that's self-explaining, isn't it ?
1 - Create a topic.
2 - Name it "Sounds by matthew23" or whatever you want.
3 - On your first post, you explain that you're going to upload all your sounds on that topic you just created.
4 - And then, start posting ONLY on that topic. When you've got one more pack to upload, just do it as a reply.
For example : topic29-19825.php
Grandslamaces doesn't create another topic each time he needs to upload a shirt, does he ? He just uploads them one after the other, on the same topic.
That what we'd like you to do.
That way, we can all know where your creations are located.