I received interest income from an installment sale. I need to allocate a portion of the int inc to another tax entity. How do I do that on Schedule B?

I have shown all the interest income on my personal 1040 schedule b, but I send a portion of the income to a trust account. TT does not ask questions about this, and I cannot edit the schedule b to show the subtraction and allocation to the other tax entity. So how is this done?