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The basic excel skills for planning engineers are equal to medium level for a normal user, I mean something like Conditional Formatting,If Formula, Vlookup formula and SUMIF formulas are fundamentals and basics for a planning engineer. It is not enough to know how to create a formula or use certain order in excel, The most important thing is to know what its application on planning i.e. how this tools or formula will help me doing my job faster and more accurate?