You can add a commands object under Transient Thermal. In the details you will see 'arg1' , 'arg2' etc that can be parameterized (below picture). You can give the value for 'arg1' in the details. Then in the commands you can use "IC,ALL,TEMP,ARG1" to specify the initial temperature. In the project view under 'parameter set' you should see this argument available.
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