You can apply actions in bulk to all Purchase Orders or a selection
These are the choices of actions you can perform in bulk to Purchase Orders...
Lock Purchase Order
Unlock Purchase Order
Supplier Confirmed
Supplier Unconfirmed
Force Close Purchase Order
Open Purchase Order
Within Purchase Orders Book Out select the Purchase Orders you wish to Update or [Select All]
Once selected, click [Bulk Action] from [X Selected] dropdown
Tip: In the below example, all Purchase Orders will be marked as Supplier Confirmed