Add Text Box info to a Certificate of Completion

I'm working to create a certificate of completion learners can print/download from within a course.  I have everything I need other than the title of the course added to the certificate.  My goal is for the course title to populate on the certificate based on a text box from a previous slide within the course.

I'm working with a large content library and need this to be automatically populated based on a slide template I'm creating for the certificate so it's realistic to implement this change in process.

Essentially, I need the contents of "Text Box 1" on "Slide 1" to be populated into "Text Box 2" on "Slide 2".  "Text Box 1" will be a place in my template where we will always put the course title in the exact naming convention that I would like displayed on the certificate.