DELBM,<start>,[end],[stride]
Delete nonlinear beams created by the B command. This will not remove any elements from the model. The beams specified in this command will no longer be flagged as nonlinear.
start - starting number of the beams to delete
end - final number of beam to delete (default = start)
stride - stride increment for delete (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.