Welcome Email WHMCS Provisioning

On the welcome email when usingWHMCS Provisioning it sends the user an email with there cpanel information but there is no cpanel if they are signing up for a site on my multisite install..

I have two servers set up .. One on my cpanel for Hosting and one with multisite for purchasing a mobile site through my multisite.

How do I change the welcome email for people purchasing a mobile site on my multiste so it does not have the irrrelavant information about there cpanel and stuff but still leave that email in place for people who are purchasing just hosting for a regular website build..?