Use an Integration Over Extra Dimension to add an integration over an extra dimension in the physics interface. It is almost identical to the Integration Over Extra Dimension you can add in the Model Builder. The main difference is how you specify the operator name and selections, which is described in the Operators section.
To add an Integration Over Extra Dimension, first add a Component, then right-click Component and add it from the context menu.
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Using Extra Dimensions in the COMSOL Multiphysics Reference Manual
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