I'd like to wrap or form the flat piece around the curved piece in my assembly. (see attached pdf)
Is there a way to do this? Maybe some sheet metal tool?
You can't model a flat piece as a part and then bend it in an assembly. SolidWorks treats all bodies as though they are rigid all the time. You need to model your plate with the same curve you want it in the assembly. Then you can insert it. If you need to match some portion of the profile of the other part, you can use in-context modeling.
Adding to what Josh said. If you model the part as a sheetmetal part and you design it in context to get it to match the curvature of the assembly you can then flatten the part in a second configuration of the part itself. You may need to model the part with a very small (.01) straight segment to be the fixed face for unbending.
Something like this?
In a assy will be like this
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