Switched to choice 300 for 2022 tax year.

Is there a counter that shows REP used and remaining?

I was to told to use all 9's for SSN or EIN to mock up a tax return so it wouldn't count against the 300 REP credit. What's the correct procedure to do this? For example I proformaed a tax return from 2021 to 2022 and was changing numbers around for a projection. Never received a REP notification. Can I change the SSN to all 9's now or is it too late ? If I reproforma the same return to have 2 copies: 1 projection and 1 tax return, will it go against my REP credit?