Changing the size of a modelled cube (Not the scale, but the actual size)

Is there a way to change the actual size of a modelled cube inside of unreal engine?
The scale property is rather useless for a changing the actual size of the parts I use to model up the level. if I make a stud wall that is 9 studs long (540 cm) and 240cm tall and then later finds out I want to remove one stud making it 480cm long, and also extend it to be 245 cm tall, then scale is not very useful.. to make matter worse it also means I cant click on the object and see what size it is.. which is also a big problem. 1.0x1.0x1.0 has no real meaning when it comes to the size of something. It might just be that I haven’t figured out how to do this.. but so far all the threads I’ve read simply says ‘change scale and rebake model’ which is a horrible way to accurately work with model size.
I understand that by changing the size of something I would change the size of every single instance of that cube, which is what I intend. I’m using the cubes to map up the main geometry of the level - and so I need to be able to quickly and easily change the size - and I need to be able to change them precise and in metric precision. Deleting and remaking the models every time I’d like to change or extend them is also not a good solution.

You probably want the modeling tools built into the engine.

To get started do Window >> Place Actors >> Geometry and there’s a custom modeling cube.

There’s a lot more to it though so look up some modeling mode tutorials.