Cumulative Column Formula with Exclusion

I have a cumulative column formula created that cumulatively adds up months, if we're in May, it will add Jan-April, if we're in June, it will add Jan-May, etc. There are some metrics the customer wants to be excluded from this formula and instead, have the formula provide the last month entered. I created a checkbox column, and I'm thinking if that checkbox is checked, the formula will not use the cumulative formula, but instead, pull the latest month entered (P01, P02, etc. in the screenshot). Any suggestions?



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