How to do to replace a SubVI?

[Giulia]

Suppose I create a VI (main1.vi) that uses a SubVI1. Then, I realize
another version of the main VI, main2.vi, which differ from main1 by
the fact that it uses SubVI2. I don't want to create a new icon,
because there is a slight difference. Just want to associate a new
file and make this association valid for main2 only. Is it possible?