I think what is being said, is that it is defined as a single block, but because each instance in the model has it's own data (description, size, etc.) they are made as unique blocks.
I you are to create a CADWorx user shape, you'll need the original block file that this was created from. You *might* be able to repurpose an insert from a model. You'll need to do some massaging to get it working with CADWorx, just as you would with catalogs and specs.
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