For CamBam version 0.802,
Select the object to move
Open the Transformation matrix
Select Transform from the drop-down list
Select the axis along which you wish to move the object
Input the distance (in units of measurement that you are using i.e. mm or inches) A negative number for X will move to the left, a positive to the right. A negative value for Y will move down the screen, positive will move up.
On the menu bar at top of CamBam screen,
Select Edit->Apply Transformations
When warning dialogue box opens, select OK.
For the later versions of CamBam, simply hold down the shift key, select the object, and drag and drop.