This week's Weekly Dynamic is shamelessly stolen from the GP Newsgroup.
If you have an existing Smartlist Builder Smartlist and you want to copy it as a template for a new SLB smartlist, you can follow these steps:
With SmartList Builder Open and the definition of the SmartList to be
duplicated loaded, click Extras >> Tools >> Duplicate and Type the new ID.
Thanks to Tim Foster for the tip!