The best way that I have found to do that is if you go under properties in the objects section and select "Set Parent"  You'll be able to set parents to various items to be able to move around as one. 

However, if you select part of the curb I believe it will highlight everything for you so you won't have to go the long way to do it. 

 

Poser Pro 2012/3DS Max 2013/Adobe Photoshop Elements 10/Zbrush/

PC: HP Z820 Workstation, 3.30 ghz 8 core Intel Processor, 2gig nvidia Quadro, 16 gig of Ram and 2TB Hard Drive.