Hi,
you have to create workflow attributes (in the "General" tab of your workflow), and bind the out parameters of the first workflow you call to them. Then you can bind the same attributes as in parameters to the second one.
Watch this video (and all the others of the series in www.vmwarelearning.com/orchestrator) to get an explanation: http://vmwarelearning.com/2nB/understanding-variables-and-variable-binding-overview/
Cheers,
Joerg