One challenge that can come up when working with transparent parts in an assembly is how to select through a transparent face. There is a setting that controls the behavior of selection with transparent parts called “Enable selection through transparency” (shown below). This setting is located under Tools, Options, System Options, Display/Selection and by default is enabled. This means that when a user clicks on a transparent component it will select through to whatever geometry is behind it.
Despite how this options is toggled there is a trick to temporarily override this setting by holding down the Shift key while selecting transparent geometry. For example, if “Enable selection through transparency” is checked in the options, then Shift-selecting the face will pick the transparent face not the items behind it.