I'm working on creating a Creator App that tracks our Rental Inventory, but I'm running into some issues. 

When we create a new rental, I need to be able to generate a packing slip. What would be the best way to execute a printable PDF form. 

When we have a rental returned, we inspect it and note any damage on the item record. I've got the page that generates a return to only show products that are marked as Checked Out. However I need to write a script or workflow that will change the Checked Out status back to Available. Everything that I have tried currently changes all the status to Available, not just the one product that I am working on. I also cannot seem to have the Return Notes field stick to the actual product record, not the return.