running page subtotal question - wondering that nobody needs

Shared hosting V5.13.26 - custom invoice design based on clean. Does nobody worldwide has invoices with multiple pages? I am really wondering because a subtotal on each page (also listed in start of following page on top of product or task listing) is very useful and customer friendly. As many other invoice systems they use pdf creation functions which are limited in use of such features - but why is there nobody worldwide who needs this feature. To be honest - feature is the wrong word - it is standard for multiple page invoices. Also that some parts have also to be listed on all invoice pages to be conform with standards. For an invoice software such simple and standard functionality should not afford a feature request. But perhaps I am not right and this is only a matter of designing the template - would really be thankful if someone has already found a possibility to list a running subtotal on every page of a multi page invoice. Dealing with groups etc. is not practicable in …