How to put a new object to become a background object？

[吉野 孝]

Hi,

How to put a new object to become a background object？

I make 20 cards with one background (grouped) object.
Then, I want to add a new object to become a background object?

I should delete 19 cards and re-copy 19 cards?
  
_.__ ._ _. ._ ._.__ .. ._._. _._ . ..__ ._.__ ._._. ___. .._ __.. __ .._ 
Takashi Yoshino 
http://www.wakayama-u.ac.jp/~yoshino/lab/
Tel: +81-73-457-8441