Adding Existing VM to Virtual NET

We have hosted application on an Azure Virtual Machine. However, it turns out that when we were setting up the VM we didn't create a virtual network and now we need to collaborate with some of our partners via VPN.
Is there a way to add our existing VM to the virtual network we just created without having to delete the VM and thus lose out VIP which is already in circulation amongst our many customers and clients?

Thanks in anticipation of your response.