Hello Brandon,
In addition to SaschaH's comment; ensure the Software Bulletin is staged / downloaded on the Patch Remediation Center; otherwise, the updates for that bulletin will not be listed in the Select Software Updates view.
As you can see here; I clicked on the Software Update link and it displayed the 'Select software updates' window. Input MS12-009; it is staged / downloaded in my environment, so it is listed when searched:
Note: if the Bulletin is not staged / downloaded; this view would be empty when searching that particular bulletin.
The policy needs to make the individual resource association for each update in the database. The process to add the bulletin is not available, and as SaschaH stated; You would need to create a new policy.
Please post any follow up questions or concerns and we will be happy to help.
Thank you,
Joshua