Hi peterw
Welcome.

I'll cover some of your other questions first, then go to the main question.

To select objects when they are aligned you use the same method as in
Build Mode: place the mouse over the
Object Icons (little white circles) then use the
Arrow Keys Up/Down to move up and down the objects. In
Advanced Move there is a limit to the navigation of 20 objects (20 objects all aligned same place). As you navigate up and down the objects, then each object will be highlighted in green. Whilst green, click and the object will be selected.
The light blue circle indicates the current object of selection is at a key on the timeline.
So if you have an object with a key (two or more keys is easier to see how this works), then as you move the timeline (red area highlighted in the timeline bar) by sliding the mouse (with left mouse button down) within the timeline, then when the timeline is at a key (white dot with white line on the timeline), the light blue circle (animates/on/off) to show you that you have positioned the timeline at a key for that object. Phew

(I'm sure I could make that sentence even longer, OK, shorter and read better

)
You will get the red circle, when the mouse is outside of the timeline bar. That is, not moving the timeline and not in the working area. The red circle highlights the objects' position as defined by the key that the mouse is closest to on the timeline.
See attached pics 1 and 2. As I move the mouse above the timeline bar, the Barricades position is highlighted as the mouse gets closer to one or other of the keys set for that position.
Is there any sources of reference where I could read about this?
There is, but from other posts. Just ask as you have and we can fill you in on the details

.
OK, now about your main question and task you want to do.
A little background.
Advanced Move is an 'advanced' animation effect than that of the
Move Effect. It is designed to provide pathing, curved paths (or linear for two keys only), and is generally there to work with single objects needing paths and timing.
Although it's possible to do what you want, it may also take some time, and some effort in trying to synchronise the two objects of the digger. There is no 'grouping' or moving selections together (has been suggested by some of our users), because
Advanced Move currently only works with animating one object per time. There is also no
Position type in as in
Build Mode, so all changes need to be done with the mouse. That's fine for single objects, and objects that do not need a more specific positioning, such as moving a person along a path.
Not saying it's not possible, but those are some of the frameworks to realise when using Advanced Move. We have also users who have created quite complex animations with many objects, so it's a 'do-able', but with effort.
Do you have any experience with other 3D modelling/animation software, such as 3ds Max, Maya, Blender etc?
One option is to consider animating the digger with it's rotations and movement in a software that has greater depth for object path animation. If the software exports (properly) to the FBX format, then it can be imported as a whole animation and then used for the rest of the scene.
For example, it would be easier to have the digger with a timed rotation animation, export to Lumion, and then create the movement path in
Advanced Move. So that you get the required end result, but it's easier to work with in Lumion because the imported animation is just one object.
There are sometimes some other 'tricks' to do things like getting ending positions exact by working with the last keys first.
The MP4 example you provided, shows you have done well to get to that point.
