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Under the 'Choose Options Binder' menu, click the 'Bean Shell Form Binder' from the Options Binder select field.
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Under the 'Configure Bean Shell Form Binder', enter your Bean shell script to populate the select fields. For each row you add to the FormRowSet, be sure to put the 'FormUtil.PROPERTY_VALUE' and 'FormUtil.PROPERTY_LABEL' fields into the FormRow that will be added into the FormRowSet. 

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Of course, you would want to want to populate the values for the PROPERTY_LABEL and PROPERTY_VALUE from your external datasource. For more information how you would connect to a database source, see the example code within 'Pre-populate Form Fields with Data from External Source'.