IRS Form 56 for Sub Trust Question

Separate Form 56s need to be filled out for file my father’s final 1040 and Initial Trust 1041 which will be filed for the 2024 tax year. I am both the Executor and Trustee and filings were done by my late father’s Estate lawyer with a county in Florida. For the Trust it looks like for “Section A. Authority” “valid trust instruments and amendments” would be checked and “Part  III Court and Administrative Proceedings” be filled out with the court information.

 
Under the main Trust my father’s lawyer also established Sub Trusts for 2 of the Beneficiaries, however both of these didn’t need to be filed with the court. Instead my father’s Estate lawyer just had me notarize notices of 2 Sub Trusts his firm drafted up and his law firm is holding a copy as well as giving me one. For both Sub Trusts 1041 Trust Tax Returns don’t have to be file for Tax Year 1024 because there is no income for each but for 2025 I anticipate 1041 tax returns would need to be filed for both because there will be Inherited IRA distributions and K-1’s will be generated. My question, since the Sub Trusts didn’t have any court proceedings rather than checking “valid trusts and instruments” under “Section A.  Authority”,  the “Other” box be checked and write something in the blank space like “The Jane Doe Sub Trust established by the John Smith Trust by the court on 10/15/2024 and leave Part III blank since there were actually no court proceedings for the Sub Trusts? I suppose another alternative for Part III is that the court proceedings information from the main Trust can be filled in as was done for the main Trust. 
 
Last year shortly after my father died I questioned my father’s Estate lawyer when he suggested that 2 Sub Trusts needed to be established. To me they seem to make things more complicated with more tax returns. I thought maybe his lawyer was trying to make more money. When I asked him why can’t I just keep good accounting records for the 2 Beneficiaries he explained to me that the Sub Trusts are for 2 special situations and it’s cleaner this way and will protect me better as a Trustee. I have since read on the internet that some Estate lawyers recommend sub trusts and others say that they aren’t needed.