How do I add a new "product name" to the Software product type

How do I add a new "product name" to the Software product type

I need to be able to add a new product under the "Software" product type but do not appear to have that option. The only option I have is to choose from a popup list of "unmanaged" software titles that have been scanned. I need to add a new software product name in order to be able to create a PO to purchase that title.

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