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How to fix CCN horizontally or vertically in Morrison-2-Moment scheme

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I have some questions to study ACI, and I hope someone can help me.
How to Set cloud condensation nuclei(CCN) or cloud droplet number condensation(CDNC) as a constant horizontally or vertically in Morrison-2-Moment Microphysical scheme? :?
Should I modify some code in Morrison-2-Moment scheme?

Best Regards!

Please read this article and find the relevant information for code modification:
Morrison, H., G. Thompson, V. Tatarskii, 2009: Impact of Cloud Microphysics on the Development of Trailing Stratiform Precipitation in a Simulated Squall Line: Comparison of One– and Two–Moment Schemes. Mon. Wea. Rev., 137, 991–1007.

I hope this is helpful for you. Due to limited human power, we cannot provide detailed instruction of code modification for each user's specific case.