PeopleSoft Test Framework (PTF) - How to open multiple browsers in Chrome/Edge?

Using PTF version 8.60.08. Executing tests in Chrome and Edge.

I am recording a Test that will be called from other Tests in the middle of execution. It needs to:

1. Open a new browser instance (Browser_2),
2. Login,
3. Navigate,
4. Add an email address to the user,
5. Save,
6. Close the browser (Browser_2),
7. The calling Test will then continue where it left off in the remaining open browser instance (Browser_1).

PTF always closes existing browser sessions and logs and informational step "Closing old browsers...".

I've tried Browser.Start, Browser.Start_Login, and Browser.WaitForNew step types, but all close existing browser windows, except for WaitForNew, which just fails to do anything. I've also tried different PTF configuration settings.