If my IRA goes through my employer and 401K, do I need to report it separately under deductions and credits?

Do you have a 401k----or an IRA?  They are not the same thing, although both are kinds of retirement plans.   If you have a 401k with your employer, it is shown on your W-2. (usually in box 12 or 13).  You enter the amount from your W-2 and you are done.  You do not enter it anywhere else.

Is it a 401K?  No, if it's on your W2 and is deducted from your pay it is already reported so do not enter it again under Deductions.  You only can deduct Traditional IRA contributions you make outside of work.   A 401k should be on your W2 in box 12 and has already been deducted from the wages in W2 box 1 and you can't deduct it again.