> One way is to retain a global variable of the saved ss, say ss_1, 
 > and then modify ss_1 by whatever you select in the process of 
 > getting ss1. To add a new ss1 to the ss_1 you would use a series 
 > of (ssadd e ss_1) where e is the entity name from each (ssname  of 
 > ss1.
  
  Well, yeah, that's basically what I'm trying to do, but what I want 
 to avoid is that whenever I issue (SSADD) to produce a nil selection 
 set, a new selection set is generated (the old selection set is no 
 longer used). The following statements are employed:
  
    (SETQ ssnull (SSADD))
    .
    .
    .
    (SETQ ss1 (SSADD entnam ssnull))
  
   Perhaps there is a better way to overwrite the original nil 
 selection set without creating a new one...
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