*HEADING
  TEST WITH TWO LEVELS OF SUBSTRUCTURES                   
   USE SUBSTRUCTURES ALREADY CREATED
*PREPRINT,HISTORY=YES
*ELEMENT,TYPE=Z101,FILE=substrframe_2level_gen3,ELSET=ZUPER2
61 , 1,11
63 ,31,21
*SUBSTRUCTURE PROPERTY,ELSET=ZUPER2
*ELEMENT,TYPE=Z201,FILE=substrframe_2level_gen4,ELSET=ZUPER1
62 ,11,21
*SUBSTRUCTURE PROPERTY,ELSET=ZUPER1
*BOUNDARY
1,1,6
31,1,6
*RESTART, WRITE
*STEP
*STATIC     
*SLOAD
62 , SNOW, -235.
*SUBSTRUCTURE PATH,ENTER ELEMENT=61
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*SUBSTRUCTURE PATH,ENTER ELEMENT=1
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*EL PRINT
S, 
*SUBSTRUCTURE PATH,LEAVE,ENTER ELEMENT=2
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*SUBSTRUCTURE PATH,LEAVE
*SUBSTRUCTURE PATH,LEAVE,ENTER ELEMENT=62
*OUTPUT,VAR=PRESELECT,FIELD
*NODE PRINT
U, 
*SUBSTRUCTURE PATH,ENTER ELEMENT=2
*OUTPUT,VAR=PRESELECT,FIELD
*EL PRINT
E, 
*SUBSTRUCTURE PATH,LEAVE
*SUBSTRUCTURE PATH,LEAVE
*NODE PRINT
U,RF
*NODE FILE
U,RF
*END STEP
*STEP
*FREQUENCY, eigensolver=lanczos
10, , 
*MODAL FILE
*NODE FILE,FREQUENCY=0
*END STEP