Manually editing NetworkConfig.xml for multi-site VPN

I'm designing a network comprised of on-premise, Azure East US VNet and Azure North Central US VNet. East will be my production VNet and North Central will be backup/dev. I want them routed together as well and accessible via on premise-VPN with RRAS and
using point-to-site. I have successfully made all these connections individually in test scenarios but never simultaneously as the portal only has one field for a site-to-site VPN and this scenario requires two.
I understand it's possible to create this design by editing the NetworkConfig.xml file. However, it's confusing to me why even when making small or no edits to the NetworkConfig.xml file the portal tells me my existing networks will be deleted and re-created.
Does that take out my gateway IPs, etc as well? If so, I'll have to re-enter all the new IPs in RRAS and basically start from scratch. I have a few test VMs in each VNet as well to test connectivity between sites. I'm guessing those would have to go too or
the VNets wouldn't be able to be deleted in the first place.
Also, an unrelated static network that I make no changes to in the xml file says it will be updated when I upload even an unchanged NetworkConfig.xml. This is concerning as it's hard to know what downtime and issues I'm going to cause if I save the new file.
Any tips would be appreciated. My sense is you have to have your whole design in your head first, get it into the NetworkConfig.xml and then move forward with creating the gateways and entering your IPs into RRAS or whatever your VPN tool my be. Being able
to edit existing VNets, specifically adding additional site-to-site VPNs after they are in use would really be helpful. Perhaps this is possible and I'm missing something.

Hi,
Firstly, you need to delete the gateway and all resources in the virtual network before you delete it.
In addition, based on my experience, you just need to add the local network sites parts into the network configuration file for a multi-site VPN connection. If you are afraid that the virtual
network configuration would be wrong after importing, I recommend you to keep the previous network configuration file as a backup. In addition, I am glad to help you with the network configuration file, you can also share me the whole network configuration
file and tell me some more detailed information about your requirement. (Please hide the Public IP addresses for your VPN gateways and VPN device.)
Meanwhile, you can also refer to the link below for reference:
https://msdn.microsoft.com/en-us/library/azure/dn690124.aspx
Best regards,
Susie
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