Parametric clones are essentially when components are made to be identical to a parent component by linking all of the Design group parameters. This can be done quite easily by choosing Groups for two matching components and clicking Link All. However, in order for this process to work, each component must have the same number and type of Group so that the links relate directly to the parameters of the parent. This tutorial demonstrates creating clones with a Pod; a very simple example in which only the Design group parameters need to be linked to create a clone. A wing, on the other hand, requires that each component has the same number of sections, the same cross-section types, etc.
In some cases, users may wish to only link all of a certain group of parameters and allow others to remain free. In such a case, you may either pick and choose individual parameters one at a time or Link All for the chosen Group.