In InstallShield 2009
how add MSI file to "after install my mproject" Install it
Your question is really hard to understand. What I've gathered is that you want to embed a second msi file in your installer and have that msi installed after the installation of the main msi completes. Is that correct?
If so, you could make a custom action that invokes installUtil on the msi. There may be a better way, but it's been a while since I've worked with InstallShield.