Yes. If you anticipate needing the same translator comments and instructions for multiple projects, you can save these project notes in your account.

Go to My Account>>Quick Links>>Update Profile>>Manage Project Notes.

You can save several project notes for future use.

Next time you submit a project using the Wizard, you'll see your saved notes in a dropdown list in Step 5. 

Don't worry, you can always modify your saved notes on the fly too.

Remember to be logged in to your account in order to load your saved notes.