The question was:

"Quite often I use the combination 'c_xyz x y z sphere radius end' for different purposes. This combination (probably the 'sphere' part) creates an object with the name of the most recently created object, thus erasing the former object, which is not what you would like to see happening. Is there a way around this problem in the current O version ?"

Simply insert an "obj name" before the Sphere command. The easiest way is to define a symbol, for example:

  symbol
  mysph
  object qqq sphere ; end