Fred there is no such call in mach3. The only thing for block delete is the slash and it is just an ignore line command. ALL lines that have it are ignored.
A single M99 call in mach3 gets you an error "Return in effect without a sub call " as there is nothing to return to(M98).
NOW CAN it be done ?? SURE it can. There are examples on this site.
(;-) TP