"Evaluation frequency" in "Boundary condition control variable" is available for solution step of SOL101.
For E.g, If you have table value with frequency, then you can use that for particular subcase.
Please find a movie for the effective usage of "Evaluation frequency" function and a use case in which load is created frequency vs pressure and corresponding values can be fetched for particular subcase of SOL 101.
Solver syntax preview was shown for the different value according to the frequency specified.