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Hi Diana - Unfortunately you cannot add a person to multiple streams within the same Engagement Program. (Add to Engagement Program - Marketo Docs - Product Documentation)
Something like this might be worth exploring for your use case:
I would recommend that you build multiple Nurture engagement programs for each product interest. This way the lead can enter two different Nurtures and you can adjust the cadence of each Nurture so that the lead doesn't receive multiple emails on the same day. Also, you can move them to the next stream based on their behavior score or behaviors, in essence serving them higher level content and CTA's based on their engagement.