How do I print vendor address to mail check for payment?
I think that bills can only be printed from the web site, that there's not an option to print directly.
There is currently no way to print mailing labels directly from Wave. Your best option would be to keep separate record of their addresses for label-making purposes.
Is there any way to create a delivery slip from an invoice?
There isn't currently a way to print a delivery slip from an invoice.
This feature is not on the roadmap for the near future. Wave is built with businesses that provide a service in mind, and those businesses make up the largest portion of our users. As we weigh competing demands to add new tools and features to Wave, we naturally lean towards enhancements that will bring the greatest benefit to the largest number of our customers.
If you're curious to read more about how we choose new features to build for Wave, you can read about it here.