I assume you have a separate data file for the Trust and one for the business if you are being audited, which I also would assume you are, like my Real Estate and my NFP Yacht club are.
If you are audited and don't have separate data files you should do, as the auditor only needs to see the Trust side, not your whole business matters.
For my NFP we had some pen owners who subleased their pens, so we would invoice the owner his fees and then invoice the person they were sub-leasing to, these invoices were allocated to a liability account with the main pen owners name and pen number coded Not Reportable, all located under a Header Account called Sub Leases.
This is what you should do. Then when you transfer any money from the trust to your main bank account for a current invoice due you would do a receive money in the main business data file to the bank account.
In the trust data file you do a spend money on the bank account and allocate it to the liability account you have for that client, or if you want to you can do a purchase from the business allocated to the liability account for the client and then pay that. Though this is just making more work for your self. I would make sure to include the name of the client and maybe invoice number in the memo field in case you accidently allocate to the wrong liability. You could then attach a copy of a PDF from reports>account transactions>filter to their account only and dates required, display and then go to insert/modify and hide or show what you want to. I would hide src, net activity, job no.
Hope this helps.