Harvesting an auto in two stages makes sense on taller strains where the top colas ripen a full week ahead of the shaded lower buds. Taking the tops first lets more light reach the bottom, and those smaller flowers fatten up noticeably in the extra days. There is a step by step on partial harvesting, including how to cut without stressing the remaining plant, on https://turboautoflowerseeds.com that I now use every run. Compact strains with an even canopy rarely need the split.
