The part under "Structural and Thermal Linear Periodic Symmetry" explains how to use periodic linear symmetry: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/wb_sim/ds_Symmetry_Region.html
Periodic Linear symmetry is used when a given structure repeats itself infinitely in a particular direction. The low and the high boundaries are basically 2 boundaries of the object in the direction in which the repetition occurs (see the figure in the documentation above). You can define the DOFs of the two boundaries to be the same or you can define constraint equations relating the DOFs of the low and high boundary.
Hope this helps,
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