There are a couple of ways to do this, and your choice will depend on what you wish to do, and how you wish to do it.
Let's start with uploading directly to YouTube from PrE. Open your Project, and do a Save_As [Project Name] Complete, or similar. Now, just Select the material for the second daughter, and Delete it. Do another Save_As [Project Name] Daughter 1, and upload to YouTube. Now, Open [Project Name] Complete again, but Select and Delete Daughter 1's material, leaving only Daughter 2. Save_As [Project Name] Daughter 2, and upload that to YouTube.
Or, you could use the WAB (Work Area Bar) to only cover Daughter 1's material, then Export/Share to a file, which would be uploaded manually to YouTube. Repeat, moving the WAB to Daughter 2's material.
That worked. Thank you!
You are most welcome.