I have had this request, also, and asked our main Canvas Administrator, @tyler_clair if we could do this. He said that, no, not within Catalog. If you have a way to collect POs outside of Canvas, there is a lengthy, inconvenient way to work around it. We don't have a good system for taking POs outside of Canvas, or at least one that was not worth the time it would take for the work around, so we have told our customers that it is not possible.
If you would like more info on the process/work around that Tyler was able to come up with, I bet you could reach out to him and he can help you.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.