If you add the bolt preload as a parameter it will show up as a column in the Parameter Set. Then you can enter the value you want based on the diameter of the bolt that is in another column. I don't know if you can use an equation, but you only have 18 rows, so that is manageable.
If you separate the models by doing File, Save As and create a new Workbench Project, then yes, each file can have it's own Preload and saved results.
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