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I have yet to find a good solution to this problem. Normally you could store the value at the class level, but I've found ArcGIS creates multiple instances of the same python class which complicates where the value actually got stored. The solution that I've used is to create a global variable that retains the value of the previous selection. I found ...


Similar response to Midavolo on the 13th May except add a Boolean parameter so the user can select an existing field or enter a new field. i.e. Add two additional input parameters 1- Boolean parameter to process an existing field from an input feature class or a new field 2 - New field

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