Dear Jerry,
For now It is possible with custom coding. We are planning to include this feature, but it will take time. I have talked with our developer and he suggested the following.
You can use javascript ajax to load a select field (with the appropriate values), depending on another select field value, these fields need not be declared as cred fields, if inside the form, they will be submitted. Then use a cred API to read the $_POST values and add to DB accordingly. The select field returned via ajax is possible to be built/rendered with the help of Views plugin, so user only needs to handle the ajax input / output.
Please check this link for more details about CRED API — http://wp-types.com/documentation/user-guides/cred-api/
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With Regards
Bigul