as the title said. if im already in one catagory in the DMOZ. may i submit to others in the hope to get more links?
Here's an answer no one likes, but applies nonetheless - it depends. It's generally not a good idea or allowed, but of course there are exceptions. For example, if you're a brick and mortar company it is likely you could get listed in your regional category, but then again in another specific category for your service if it's something applicable.
Yes you can, well... maybe. If your site applies, you can always submit a site to the Kids section or the regional section in addition to the standard category. You can also submit deeplinks if it offers significant unique and different content.
If you're Rubylane, you can get links galore. No upper limit. Special treatment for Rubylane. Ask them their secret.
Provide the URL and where it is currently listed, and I am sure people will advise you where else the site might qualify for.