You mean you took out 80,000? When you entered the 1099R you enter the withholding from box 4 for federal and box 12 for state. The withholding will show up on your tax returns with your other withholding from your W2s, etc. on 1040 line 64.
I didn't follow the rest of your post. The Distribution is only after tax if you contributed to it with after tax money. But 401k is pre-tax. You are not paying tax on the amount rolled over. Just on the amount you did not roll over. The amount you put into the IRA will stay pre-tax until you take it out. (unless you rolled it over to a ROTH IRA).
