Excluding from BOM part 2.

Okay,

I have 2 drawings that have the same parts on it. But the second drawing has a few more parts on it. I only want to include one part from the first BOM and the new parts in the BOM on Drwaing #2. My issue is that if I exclude the parts from the BOM on drawing #2, it also excludes them from drawing #1.

What do I have to do so I don't exclude them on drawing #1? 

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