Let’s arrange your Groups and Components to make them easier to work with.
First, you have Side Walls inside of a Component named Front Face. This isn’t a logical grouping in my view, so I click and drag that group out of the Front Face component.
Now I toggle the Visibility of Front Face and Group off. I can see that there is still loose geometry hiding there. So I select all of that and create a component, “Beam”. I turn the Visibility of Beam off and turn the Group that has Sides in it back on. That stuff in front is most likely duplicated geometry from when you were creating the Front. So, I enter the Group context, select the face and lines and delete them.
Although there is only one component in Group, I’m going to keep it and rename it, “Side Walls”. That way I can put the other Side Walls (Right side walls) in there later. Since the last unnamed Group is going to be that side wall, I drag it into the Side Walls group.
Now since I’d rather have component Side Walls, I explode the Group and then immediately create a component, “Right side walls”.
Here the Front Face and Window System Top overlapping. What I mean is that part of the Front Face component is behind the windows. So I draw lines on the face where the windows sit.
Then delete that part of the Front Face component.
The Window System Top doesn’t have a back side, so I draw it. Notice that I’m getting into the context of the Window System and not just the Front Face component. It is nested so I have to click into each of them.
There is also some overlapping geometry so I draw those little lines and then delete the overlapping part.
I missed some of the little extra stuff that I need to delete. I’m going to take the Window System out of the Front Face component for better control. Then I draw the ends of the Window System to make it a solid component.
Okay, now to put the components into a Group, “Front”.
I rename the Front Face component to “Wall”. Then I drag the Beam into the Front Group because it belongs with the Front components.
At this point I’d start making window and frame components if I kept at it. I think you need to work on making components and putting them into groups. That way you can easily toggle visibility to isolate what you are working on. Then pay close attention to WHAT you are working on - meaning the context you are editing in.