I think we have a solution!!!
I called the "Help Line" again and was put-through to a representative named "Dave" , from Myrtle Beach, SC.
Dave understood my problem, and emailed a solution to me in about 4 minutes.
The solution:
Rather than creating a Schedule 1 and trying to force a deduction into Line 24z of Part II of Schedule 1, Dave suggested that I go to "View Forms" and navigate to "1040 / 1040SR Wks".
From there, I scroll down to "Part II - Adjustments to Income", and look for the outlined box that appears just below Row 23. Dave suggested I use Line "G" in that box to insert my deduction. This action will create a properly-completed Schedule 1.
And....it worked !!!!
(At least I think it did.) :-;
