[xubuntu] Triple boot Xubuntu 12.04 on new HD. Grub install questions.

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http://ubuntuforums.org – New drive to go into machine. Just one. I want to triple boot again only all Xubuntu 12.04 as primary, Xubuntu 12.04 as experimental, and Xubuntu as next. I want to have grub installed to all. But, grub installed to the drive for primary Xubuntu. So I plan to use "The Something Else" while installing all of them after having made up the partitioning with a live CD with Gparted. Question: To install the grubs, the last one installed will have grub installed naturally. If I go to the primary and run below, will this attach it to the primary. Cod (Hardware)