Falconperigot thank you for pointing me to the modifier in the Assemly Room. I realized that the 'Project Gemini' isn't for me because it is too confusing to use it. I thought it was symmeterical pointer plug in in the modelling room. It was actually just an automated union boolean plug in. $29.95 for it? eh. Janitor expected to make profit over this simple plug ins like this one. He want $359.45 for all his plug-ins to end users, this is equivent to a core software with advanced scripts. Only few of his plug-ins are worth to buy is 'Power Pack' everything else is just scrape collections that manipulated with Carrara's functions.