Who is this form aimed at?
Essentially, any company is big enough so its employees and branches have to communicate through email and request material or whatnot through forms. The purchase order request form is usually employed within a business, as a tool to let the guys from the warehouse know how many boxes of paper you need (yeah, there's a reference in there).
Is it customisable?
Don't let the fact that you're going to send this to people that already work with you distract you from a more interesting fact: self-expressing yourself through any of the available templates is not only going to fulfill the role of this form but also flood your heart with the warmness of satisfaction. Remember that teacher from second grade that told you: "You could never be an artist"? No? Well, the point is: You can, now. Get your artist boots on and start playing around with the fonts, colors, design, and everything you could ever hope for when thinking about a purchase order request form template.
How do I deliver it?
Pretty straightforward, don't you think? If you're using this form for what it's meant to be used, you should have no trouble making this reach its audience. In case you would want to use it outside of your company, perhaps an email or embedding the form on a website or social media might be the way to go.