serial command, modifications, or exploding

[Yebisu]

I have a series of 3 consisting of about fifteen elements , I should make a change to one plate of the whole series is possible to exclude it from the series and change it?
or how do I delete the series like an explosion that keeps me all copies?
Thank you.

 

[Matteo Cappelli dis.CAD]

I will make it così:

 

[Yebisu]

This works with single element in this case from you reported a sheet, I have a group of elements consisting of screws and plates and assemblies thanks anyway.

 

[Matteo Cappelli dis.CAD]

But, I think it's the same thing.
If I understood correctly, I tried to recreate your example
following the previous instructions, I get a series of 3 elements where the 2 is made independent and the sheet b has been replaced by the c
in case I don't understand, if you kindly take me a screenshot

Hi.