did you move the body?
The sketch used to create the feature will stay in its original position. It looks like you moved the Body, but that's another feature, so it doesn't affect the original sketch. If you want the sketch to move, then you'll need to create a new plane, above the sketch in the tree, and move the sketch onto it. Depending on your needs that may eliminate the need for the Move Body feature.
Or put the move before the sketch, as long as the sketch is somehow driven by body position (e.g., on a face of the body).
I can't get past the first sketch not being fully defined - that is the foundation for everything.
post the model, and we can take a look at it, but the first thing I would do is fully define that first sketch.
...and why is it a multi-body part?
Here's my SolidWorks file, maybe you will be able to help me out.
I just feel like I should start over from the beginning and sketch it on the right plane from the start.
The thing is, I'm a 3DS Max user and my goal was to make one piece and duplicate/mirror it to make the others 3 part, I need a total of 4.
Download link: http://s000.tinyupload.com/?file_id=00377029003169424416
EDIT: The file is made with SolidWorks 2016
As you spend more time with SOLIDWORKS you will learn many different techniques for building parts, and you will quickly become more efficient and accurate.
Here are some of my recommendations:
Start with the most prominent "profile" for your first sketch/feature.
(Your 4 extrudes can be done in a single extrude if you use the full profile.)
Do some research on sketch relations and construction geometry, this will clean things up a lot.
Check out the hole wizard - great feature for creating multiple holes, and it makes annotating your drawing easier.
Most importantly, fully define all of your sketches - this will resolve a majority of your issues.
(Every sketch for an extrude was under defined - the cuts were defined.)
You should be able to model this part with 3 features -
I think I was able to do it with 10 dimensions (14 if you count the ones added for the hole wizard diameter & depth)
Starting over isn't always a bad thing, it usually means that you learned something new.