Create a parameter Field Type - i.e., PO Number, Asset Number, etc. You should create a pick-list for this one to limit it to pre-defined values rather than relying on your users to type it in correctly.
Create a parameter for the Field Value.
Create a formula to use with your selection criteria. It would look something like this:
Switch(
{?Field Name} = "PO Number", {table.PO_Number} = {?Field Value},
{?Field Name} = "Asset Number", {table.Asset_No} = {?Field Value},
<other fields here>
True, True)
-Dell
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