Select the thickness group to Auto Select.
Right-click the header of the Reference Thickness group from the Parameters table, and then select Auto Select Thickness Group.
The software shows the AutoSelect set for thicknesses on the parameter grid.
The functionality to set thickness to AutoSelect is for Cutting to select the technology according on this set. Cutting selects the technology where AutoSelect is set on for the current plate thickness. It will go through the technologies finding the thicknesses where AutoSelect is set.