The question was: "Is there a way to color symmetry related molecules in a different color than the working parent molecule?"

depends on how they were created:

• - symm_obj -> get the same colour as the parent object (i.e., if you want different colours, you have to create multiple differently-coloured copies of the parent molecule)

• - symm_sph -> are independent molecules in the database and can therefore be coloured any way you like

another command that may be of use is rot_tran_obj