There are several ways that this can be accomplished, and the best solution depends on a few considerations.
In this scenario, the virtual machine will function as if it simply has no network cable plugged in.
If the virtual machine requires no external connectivity to any other network, then before powering on the virtual machine edit the NIC and remove the attached network.
To accomplish this follow these steps:
In this scenario, an administrator will create a new internal network that contains no other virtual machines.
If the VM requires external network connectivity, this is the preferred method.
Information about creating an Internal Network can be found in the inline help within the category titled Networking in the section titled "Internal Networks".
When creating a new internal network, make sure to set a Default Gateway so that this network has outbound access.
After creating a new internal network, modify the virtual machine's NIC so that it is connected to the newly created internal network.
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