Capping Consumption; Spending

How to model actual consumption less than smoothed consumption in retirement

This is a retirement spending question. ESP assumes I will take the smoothed consumption and spend it. How would I model the case where I plan to just spend what I estimate I need, and to leave the remainder in place, or perhaps move it from tax deferred IRA to a taxable account? Would I have to hone in on the situation by trial and error, assuming various estate values until I get close to my desired spending level, or is there a more direct way?
thanks
ken

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