It sounds like you are trying to claim a credit for tax paid to New York on your Connecticut return.
There is no credit, unless you continued to work in New York after moving to CT.
If you did work in New York after moving to CT then you will have to figure the income and tax yourself, because NY will be taxing your total income.
One way to calculate the amounts is to use NY state wages in Box 16 of your W-2 and subtract CT wages in Box 16. That's your NY wages.
Next, take that number and divide by total wages and multiple by the tax liability on IT-203 line 50.
For example if you have $40,000 in NY and $100,000 total, then multiple 40% ($40k/$100k) x Total New York State Taxes for the tax liability for NY.
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