Note: this is for capital losses, but I think it will be the same for other carry over items. 

If the client knows the correct amount, I did it once this way: 

click where to enter icon, 

choose Carryover, Federal Carryover worksheet,

choose or look for :

short term or long term, 

input the amount in positive numbers only. 

It will carry over for future years. 

Hope this helps, it might be another way. I found that way myself and it worked well. 

Thank you