PDEL,<start>,[end],[stride]
Delete nonlinear panels that are in ACS-SASSI User Interface memory.This command will only remove nonlinear model data created by the P command  This will not remove any elements, linear model data, or other nonlinear data from the model.
 start - the starting backbone curve to delete
 
 end - the last backbone curve to delete (default = start)
 
 stride - stride increment for deleting backbone curves (default = 1)  The command will warn the user that the default stride was used if the argument is left blank or the user gives a stride value less than 1.