I'd like to suggest the following changes to the current Create PO process based on my brief usage:
1. Add new PO lines at the top of the listing rather than the bottom. This will prevent needless scrolling for POs that have more than just a few lines. Or if easier, just move the SKU, Name input box to an area below the line listing.
2. The ability to add new part numbers as part of the PO creation process. Seems like a simple change and again, would prevent needless jumping back and forth between Add Products and adding new PO lines.
I've seen the request thread for adding POs via CSV file uploads and that would be a preferred method over the above changes. (If the new process will auto-add new part numbers if needed as part of the PO creation.) But if that change is far off in the future, then the above would do in the meantime.