this is Freya and she is going to help with this
Step 1
go into buy mode and into misc decor then click on omsd which looks like a pole, place this in the room/area you want to use it
step 2
open up testingcheatsenabled and moveobjects on, also if you are using pose player place this in the room ready
step 3
get your sim into the desired pose or get your object ready for moving
step 4
go into buy mode and roll your cursor over the checked square, press ctrl and shift together on your keyboard this opens up the height menu, set height required
step 5
using moveobjects on, move your sim/object onto checked square now you can move all together to the place you want them to be, you can adjust the height as many times as you need by using the same step as above
step 6
return to live mode and take a snapshot, as you can see below i used a bed
if you have any more questions just ask i am here to help twinzie