Assembly Design 
Hello guys!

I am using Assembly Design to reposition the components of a tool resource. However, I am not acquainted with this application and cannot move them properly. When trying to move one of its parts, the entire model is moved together. You can see that in the following video:

 

I tried to use multiple positioning tools but I do not know how to use them. I also tried to rely on the User's Guide for the Assembly Design program and I found that I could hold the "Shift" key while trying to move the parts to make them move without considering engineering connections, but it did not solve my problem. I also tried to delete any "Fix" joint from the project, but it did not work as well.

The only solution I found was to copy the part, and then paste it inside the tool resource in the Spec Tree. After pasting it, a small positioning menu appears that allows me to position the part without moving the entire assembly along with the Robot Manipulation. However, after positioning the part, I can no longer move it. Here is a video for clarification:
 

In conclusion, what can I do to not make the project behave like that? Thank you in advance for any help provided.

 
(I must say that I am not that experienced with 3DExperience. I have been using it for 3 months only. I might not understand some specific terms or tools, but I would be glad to learn more. please be patient!)