Delete Original Text on CERTAIN emails

I use google voice on my bb pearl... I was wondering if there's a way to automatically delete the original text ONLY when replying to an email from google voice?

Pre-emptive question-answers:
-Why delete original text?
If I don't, the text message reply takes 2 or 3 "texts" for the other person.
-Why not just "delete original text" on every email?
I do a lot of replies while on the go from my blackberry, so there are certain times when I need the reply so the (whichever) Office can keep track of what the conversation is about.

There's a free app called Forward, Reply, Edit that will let you selectively delete the original text in forward or reply messages. Here's one link that may work: About BberryApp.com, Forward, Reply and Edit