How do you instantly place a unit/object higher up?

Sometimes you want to move a unit to another floor in a building or more often or not you want to pile sandbags on top of each other to provide more cover.

 unitA setpos [getpos unitA select 0, getpos unitA select 1, (getpos unitA select 2) + 5]

That will place unitA,  5 metres in the air at his current position. When placing units within buildings, height values need to be experimented with.