The income you earned while you lived in Delaware IS Delaware sourced income so you do not zero the amounts as Delaware source. Delaware uses the total federal income then applies the ratio of the Delaware source income including any adjustments.
Here is the 2024 PIT-NON- the numbers you are referring to do not make sense- there is no 45a and 45b. Delaware Individual Non-Resident and Amended Income Tax Form (PIT-NON).
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