You can inter-transfer the bonuses you have received by XM, the bonus will be reflected into the received account according to the % of the bonus.
e.g. Deposit $100 and receive $50 as bonus.
Transfer $50 from the account to another.
$75 will be reflected into the another account, and $75 remains in the original account.
The condition maybe different for each promotion. For more information, please contact XM support team.