In Purchase Order, how do i change the status from pending receipt to billed/closed?

Post the item recipt to recieve all items. Then enter the vendor bill to bill all items

Can i do it automatically ?

You can change the items so they don’t need to be received. On the item record you can make it as “can be received = F Then use a workflow to transform the PO into vendor bill automatically

Thank you, i will check this approach