What exactly do you mean by "manual entry forms"?

If you mean making entries on forms, it is not available in ProConnect Tax, which is an input-based tax program.  ProSeries, on the other hand, is form-based.

You can, however, open multiple windows to preview forms by clicking on the "Preview forms" button in the top-right corner of the input screen.  Many (but not all) lines on the forms have a link (denoted as a blue highlight) that will bring you to the relevant main input screen (but not to the exact input field).  The forms on preview also do not refresh themselves as you make data entries - to see the changes, you need to hit "Refresh forms".  To learn more about this feature, you can watch this video on YouTube: https://www.youtube.com/watch?v=6V9sQHYbV2Q&t=27s