Confused about a recent permission to transfer a paid (private/un-published) site I am building to a trial site on my own dashboard.

Hello! I am confused over whether I can successfully transfer not only my domain, but my fully paid (with student discount for one year) website subscription and other items to a trial site on my dashboard without trouble. I have decided to change the look and feel of my website. I have tried to create the same look and feel on the active site, but the theme does not support exactly what I want. Could someone advise if this will be problematic? Should I keep my domain on my paid site and just deal with the look and feel I am working with? Thank you kindly! ~EGM