Hey @michaelaj! You can add values to parameters without a control from within the parameter dialog. Where it says "Current Value" (or, in prior versions, "Default"), you can type in each value and hit enter to add it:
Your list will stay locked into these values unless you assign that parameter to a control. If you do that, it will completely replace the typed list.
This is actually a really nice way to add some hidden control over your report. For example, maybe you want to add some sort of adjustment factor to various calculations, but you want to keep that factor hidden so a viewer can't adjust it. You can add the adjustment factor to a parameter as its current value, then pass it to any calculation that you want. You can adjust the value of that parameter by opening the dialog and typing in a new value and saving the report.
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