how to create a reference part on a table

[fabietto75]

Hello, everyone!
I would like that in the table of the assemblies the components of the separate appeared to me drawn to indicate precisely, that I am there, but only as a reference, but I did not understand how to do.
Can anyone give me some advice?
Thank you!

 

[reb_bl]

go to 3d, tree selections your part, dx key, distinct structure components, reference

 

[fabietto75]

go to 3d, tree selections your part, dx key, distinct structure components, reference

Thank you! !