Screen 14 - enter the asset; then under General - 6th line down 1=yes/2=no to override.  Or the next box down = elect out of SDA.   There's a box to click on " Complete Election Statement".  

And be aware that this has to be done for all assets acquired in the year that are in the same 'life'.

Codes 399 & 488 if you speak "batch" entry.