Look for the Carryover section on the Foreign Tax Credit Computation Worksheet 

I got there by the clicking the  Source Line icon from Form1116 part III line 10

Edit:   sorry I use Proseries not Lacerte- program options not the same   

and I had tired eyes -  carryback/carryover....not the same     I focused on the Part III, line 10

listen to @itonewbie          

Happy day everyone.