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When a component exists in several instances in a project, creating a link (Link) with the original component allows it to be drawn only once.
In this case, it is even more interesting to first encapsulate the component in an assembly container that will be specific to it (As_Wheel), outside the main assembly sAs_Axle.
From a link, the Element Count property appears (the value 0 means that the link is the only instance of this link). If we replace 0 by 2, 3 ... we will have 2, 3 ... instances in total.
We will then use in the main assembly only the link of this component in order to define the number (total) of instances necessary for the project by the ElementCount property.