ensuring the transfer of funds back home in international trade and finance

With regards to international trade and finance in AFM, one of the possible ways a company can ensure that it can transfer funds back home is that it will:

1- sell goods to subsidiary
2- Charge royalty to subsidiary
3- charge high interest on loans to subsidiary.

If the parent company, cannot transfer high amounts back home due to legal restrictions, how does it benefit by charging more to its subsidiary?

Isn’t it just accumulating more cash that it can’t send home? Wouldn’t the parent company be able to transfer more money out of the country by buying goods from subsidiary, paying high interest on loans and paying royalty fees and management charges to subsidiary?

Kindly help

Thanks