You don't deduct his CT income on his NY tax return.  Are you familiar with both reciprocity and with credit for taxes paid to another state?  If not, Google it.

This does not answer my question. There is no reciprocity between these two states.  My question was how is it handled in the Pro Series Basic Tax Program.

All income is taxable to NY. File CT nonresident return. NY gives a credit for tax paid to CT.

Do you know where to enter the CT income taxes paid on the New York return?