Can I change the size of the tear-off portion?

Yes, you can change the size of the tear-off portion at the bottom. When you upload your file, include a dashed line in a spot colour named "die-line" in the position that you would like the perforation to be in. It is important that it be a spot colour swatch and that it is called "die-line" as our system is set up to automatically remove this from the final press file so it does not print.