All Vendor option for POs

There might be a way to do this, but I couldn't figure it out. I created a PO from an invoice for a bunch of hardware. The images are clipped from various vendors, but I buy all the hardware from a local hardware shop. We are only given the option to choose the vendors from which the items were clipped from (in my case it made 4 different POs, I just needed 1). To go about it a different way, I added the vendor as a product, added it to the invoice, then made the PO, which gave me the option to choose the local hardware store as my vendor. I then added all the different vendor items from the project board. I hope this makes sense! I know it's very specific, but there needs to be a way to be able to choose from my whole list of vendors & not limited to the ones on the invoice. If there's actually a way of doing this already that I did not figure out, please let me know. THANKS!