Hi PhilipDAth, Thanks for the confirmation. I actually found an old TZ400 in our storeroom, so was able to lab this up with 2 Meraki switches (MS350 and 320) about 2 hours ago, and confirm what I suspected and you had confirmed. The SVI I created was already in the transit vlan, and I left the management IP unchanged (what I was referring as the local IP), and changed the default route to the new sub interface I created on the Sonicwall (10.0.0.2). As soon as I did this I lost internet connectivity. After changing the management IP to 10.0.0.3 and vlan tag to 100, it worked. Thanks for your assistance and confirmation 🙂
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