How create new file with specified size

What are the steps, in order to create a new file with its canvas of size, say, 8cm high by 10 cm wide, and with units being cm? And is it possible to create such a canvas where the origin is in the center rather than at the upper-left corner?

Hey again @murray , it seems from another post that you’ve figured this out. Just in case, I’m sharing the article that explains how to create a custom canvas size. As for the origin, we don’t currently have that feature, but I’ve recorded it as an idea and will share it with the product team.