A clarification about accessing the student information worksheet in the forms mode. You want to change line 17 (used for credit or deduction) to $4000.
Change the box in the first column ("Total"). That automatically changes the other boxes, including the 529 column.
I earlier may have suggested changing it in the 529 column. That requires using "override"; whereas the Total column allows a direct entry (at least it does in the desktop software).
