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You've referred to 'sub-surfaces' in your title, but only mention 'surfaces' in your question. You're probably not drawing the surfaces within an OpenStudio Space. Have you watched the tutorials on YouTube? Everything you need to know is at the bottom of this page.

I'm pretty sure this is a duplicate question, but I'll answer it anyway.

You've referred to 'sub-surfaces' in your title, but only mention 'surfaces' in your question. You're probably not drawing the surfaces within an OpenStudio Space. Have you watched the tutorials on YouTube? Everything you need to know is at the bottom of this page.