The Blanket PO History can be accessed by selecting Purchasing and then Blanket PO History. This section of MVP One will display a list of all Closed Blanket PO records. 

When Blanket POs are closed they will be moved from the Blanket PO List (Purchasing> Blanket POs) to the Blanket PO History.

For a list of actions that can be performed from the Blanket PO History please reference this article.