Same product, different parts

[DJFinfan]

Hi everybody, first of all sorry about my english (I'm from Spain). I would like to make a question, because I have a problem with my design.
I have 6 products, and each one of them has 4 parts. All of them are identical, except one of the part on two of the products. This difference is just a hole. So then I have 6 identical products, but in 2 of them there is a different part (the one with the hole).
If I make the hole on the 2 different parts, it appears on all of them. Is there any way to make it visible just on the two differents parts i want?
Please.............HELLLLLLLLLLPPPP.......

Thank you everybody

 

[jackk]

Sounds like you have the same part instanced in all 6 of the assemblies. Replace the part without the hole and subtiture the part with the hole.