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For example, your web site has a category on programming software and another category on networking hardware. If you have both categories on different sub-domains, you can submit the sub domain on software and the sub domain on hardware under their relevant categories in the directory. Directories will not consider it spam since the two URLs are for two different topics.

For branding purposes, however, it is better to submit just one URL to the directories. The reason why directories are so particular about content is because they are offering a service. If they are known to be good at listing, they get traffic and if they are not, they do not get traffic. Directories always need relevant listings. This is why many website owners will find it difficult to get their sites listed if their sites are not relevant to the niche of the directory they are submitting to.

MORE TO COME!