There are multiple solution to breakdown Outlook PST file into multiple smaller parts. First of all try to use Outlook inbuilt utility to break down PST into multiple small size PST. For complete manual steps read this article ...
There are no solution available for manual conversion of OST to PST. So, you need to take help of third party solution to convert OST to PST.
Search with "Revove OST to PST Converter" in google search bar and you will get multiple number solution there.
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