Is there a way to download all the diverse suppliers for Tier 2?

There is no option to download the diverse suppliers that are currently already available in the database. However, you can search your suppliers using Option 1. Type in the first few letters of the company name and the system will give you a list company names. 

Suggestion - Use the supplier's legal name when searching before using the supplier's DBA. If the supplier is not in the database, you can add the supplier as needed.