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How can I build a good vol surface using QuantlibXl? My goal is to price a swaption 5 year with option maturity 1Y1M.

The data are:

vol ATM swaptions

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The procedure is to build an ATM swaption vol matrix using qlSwaptionVTSMatrix. Then extend that to a swaption vol cube to add the skew data using qlSwaptionVolCube2. Then you can feed this volcube to a swaption pricer. You can find arguments for these functions here: https://www.quantlib.org/quantlibxl/allfunctions.html. Note that QuantlibXL limits swaption valuation to ShiftedLognormal vols, so you cannot use a normal vols for instance.

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