Is the following description of a multi-level meeting correct?

Multi-level conferencing supports splitting and merging meetings.

When you hold a multi-level meeting, you can "add a venue" operation to the root meeting.

SMC2.0 supports a 5-level conference template up to a maximum of 5 levels to meet the needs of multi-administrative level conferences such as government departments.

When you hold a multi-level meeting, you cannot set up multi-screen polling for a venue in a sub-conference.