OVH IPv4 Subnet Setup Help

I need an extra IPv4 subnet assigned to my OVH-hosted dedicated server, which is currently running Linux. Once the range is attached to the account, I also want clear, step-by-step guidance on how to configure the new addresses myself so I can safely repeat the process whenever I order more blocks in the future.

Here’s what I’m looking for:

• Verify the correct procedure for ordering an additional IPv4 block through the OVH control panel and let me know of any pitfalls or lead-times I should expect.
• Once the subnet appears in my account, walk me through routing it on the OVH network (including adjustments in the Manager, vRack if relevant, and any necessary MAC or virtual interface declarations).
• Provide the exact Linux networking commands and config-file edits (Debian/Ubuntu style is fine) to bring the new IPs online permanently, covering both Netplan and traditional /etc/network/interfaces approaches.
• Supply a concise cheat-sheet I can keep for future reference, outlining all commands and files that need modification.

When we’re done I expect to see the new addresses pingable from the internet and the written guide delivered as a small markdown or text document.