Create a field similar to requestID field that increments automatically

Create a field similar to requestID field that increments automatically

I have created a Service Request form to use for our Network Change controls (NCC). The NCC are currently paper based forms. Our QA team assigns the next available NCC number to each request. It is in the format of N.1935 then N.1936 etc. Is there a way to create a field that will do this? It must start with N.

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