Are you currently utilizing tags for these contacts, @JenniferS7 ? Tags can be used in tandem with segmentation, or just narrowing-by-tag for sending emails to specified lists (for accounts with less than 10k contacts). You could set tags for everything from industry types, vendor vs. some other client type, etc.
Segmentation isn't necessarily a catch-all for dozens of different cirteria. The reason I'm bringing up these other contact management functions is because, based on what you're describing, this should already be possible with the exiting functionalities- it's just a matter of how the contacts are managed on a case-by-case basis.
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