In the package editor, add a website option.

We would need the following changes in the packages setting :
 
I would like to created a plan that will entitle the user to have one web site (Main domain) but could park 5 domains on his website.
Currently, to do this, in the package editor, you need to allow for 6 domains, so the client could do 6 differents website instead of only one website and parked alias.
 
Thank you!