Hide an Impact Assembly futures on Part level.

Hello, everyone! Could some describe solving an issue with Assembly Futures (AFs) on a part level, please.
1) I created parts of mechanism and drawings of these parts. There're about 100 parts. 

2) Next, I created an assembly which was based on those parts.

3) Also, I added AFs (holes and etc) in the assembly level and created a drawing based on the assembly.

Despite of adding AFs only an assembly level, parts changed as well. It means that all my drawings of parts was needed in update and became incorrect (it mustn't have AFs). So, I need a methodology how I'll use AF's without impact on Part level like in another CADs. Thank you!