As a budget holder, it is possible to transfer the approval task to another budget holder or approver. This can be done using the functionality: change budget holder.
To do this, click on the icon next to the button 'Approve'.
A pop-up will then open where you can select another budget holder and send a message.
It is important to mention that only the approval task assigned to you as the budget holder will be transferred to the newly chosen budget holder. This change can't be undone.