Last Name Only

I am fairly new to Crystal Reports and need some help with a report design. I am trying to extract just the Last Name from a field that contains both First and Last Name in one string.
Any help would be greatly appreciated.
Thanks,
Hanseleg. Create a formula and write this
stringVar sp;
sp:="Test1 test2";
mid(sp,instr(sp," ",1)+1,len(sp))