Hi KurianOfBorg,
The function to create Rule (transport rule) in ECP(Exchange Control Panel) is not available in Office 365 for small business(Exchange Online P1) currently. If you have some concern about the "transport rule in Office 365 for small business" feature in Office 365, I would suggest you submitting a feedback at
support.microsoft.com/.../survey.aspx
Additionally, if you have some issues in Office 365, I suggest you post a new thread about the detailed information of the issue you encountered. this is so we could focus on your questions and provide more specific solutions for you.
Thanks,
Linda Wang