changing MSI Installer defaults?

Hello Everyone!

This is my first question ever online, so kindly excuse any mistakes. I have a .msi installer file which installs 8 services / components on the computer to be used by all users. i do not need 3 of the services / components and wish to edit the installer such that, by default in a silent install the installer only installs the required 5 services / components. please help. i am having Orca but so not know the right options to change. thanks a lot.
🙂