Just FYI in you are interested to delink from TSG.
These were the steps i have taken when I switched to IBKR.

In order to request a manual internal transfer please create a ticket online by following the steps below.
Please log into your client portal -> support -> scroll down to “web ticket” -> compose -> new ticket -> subject: manual internal transfer -> search Ibot -> continue to ticket -> Category: Funds & Banking – Position Transfers -> preview ticket and submit

In the detailed description (body) please mention the source/destination account numbers along with the positions/cash to be transferred. Please note that such transfers are subject to compliance review and approval. Time for review and processing upon approval can take up to 3 weeks.

Cheers.