Go to screen 15, click on one of your NOL's, hit Ctrl-W to switch to batch mode, enter code 46, then enter a dollar amount (-1 if zero of the loss is being absorbed).  Hit Ctrl-W again, and you should be on the field where the entry needs to be made.  You can then adjust the dollar amount to whatever you need it to be, and hit the Ctrl-[up or down arrow] to scroll to the same field in the other losses.  Make sure your screen is set so you only see the grid in the top portion and can see the detail entry area below the grid.