Combining 2 groups of entities?

[tomot]

I want to combine 2 groups of entities, so if the user decides to do a delete, her or she only has to do that once.

group = entities.add_group
r_entities=group.entities

(there are 6 entities in this group)

group = entities.add_group
rr_entities=group.entities

(there are 4 entities in this group)

How do I make a group that combines r_entities &rr_entities ?

TIA!

[Dan Rathbun]

begin
  #
  model.start_operation('Add nested group')
  ### OPERATION
  #
  editents = model.active_entities()

  topgrp  = editents.add_group()
  topents = topgrp.entities()

  group1 = topents.add_group()
  r_entities = group1.entities()
  #(add entities to group1 here)
   
  group2 = topents.add_group()
  rr_entities = group2.entities()
  #(add entities to group2 here)
  
  #
  ###
  model.commit_operation()
  #
rescue Exception => e
  model.abort_operation()
  puts(e.message)
  puts(e.backtrace)
end