Welcome to our community, Helen
I'm not sure I fully understand what the issue is here. You
cite wanting to use Topic A more than once in the TOC. No problem
there.
You state you created a Snippet with the full contents of a
topic and are using the Snippet in two different topics. Okay, no
problem there either. I'm guessing the Breadcrumbs are correct now
for both topics, no?
But if you basically used the same Topic Titles for each
topic containing the Snippet, how are you expecting it to be
presented to the user when a search is conducted? I think you would
need to ensure the Topic Title is different for each of the topics
using a Snippet.
Cheers... Rick