Assignment only takes place if the load carrier is large enough. If the carrier is red, the part will not fit. If it lights up blue, the component can be assigned. Just let it go in the carrier. If you have named the part before, the name of the object will be displayed on the carrier.
If you then switch to Halocline Performance, you can now remove an infinite number of parts from the load carrier.
To detach the part from the load carrier, select the load carrier again using the Adjust tool. With another click you can select the part or CAD object. Note that the controller must be inside the load carrier. Now move the component out of the load carrier again.