The AMF TestStep can be used for sending AMF remote calls over HTTP (AMF being Adobes ActionScript Messaging Format used by Flash/Flex applications to interact with a server backend).
The new AMF TestStep lets you perform call to AMF server with access to all the XML-related bells-and-whistles (assertions, property-transfers, etc) .
Now create an empty SoapUI project and then manually add a TestSuite, a TestCase and finally add an AMF Request TestStep.
The new AMF Request window contains the following components:

For the Request:
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1. Endpoint
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2. AMF Call
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3. Parameters table
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4. Script editor
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5. HTTP Header inspector
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6. AMF Header inspector
For the Response:
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7. XML view
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8. RAW view
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9. HTTP Headers inspector
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10. AMF Header inspector