A VPS Unlimited domains can only be installed in a virtual environment, and the 35 Domains license is limited to 35 domains, you can't use secondary domains and works on both VPS and Dedicated servers.
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To place an order for a Slave please go to your service row and click on "manage". After you will see where you can re-issue your SolusVM License, etc, click on "Change Configurable Options". You can then use the sliders to add slaves to your license.