Moving multiple objects

[Anonymous]

Please look at my attachments. I have built a terrain and a model of a house. I want to move the house onto the terrain or the other way. i try marquee, but when i place the objects together, the walls seem to dissapear. anyone knows what this is? i have subtracted a slab on the terrain mesh to make a hole for the house.
any help/tips/ideas?
cheers Petter

[Anonymous]

Were your walls selected as targets when you did the SEO on the terrain mesh?