How to reorder / move new pages and subform instances

Question

I have a form that has 2 functions - show a hidden page and duplicate the Page 1 and I need to reorder the pages once the user has added an instance or shown a page. I have Form A (Page 1) that can be duplicated but the user can add in a Form C (extra page) to be attached at the end of that instance of Form A.  So it goes like this:
Form A (Page 1)
button 1 - Adds new page 2 "Form C" to end of that "Form A"
if (CompleteFormC.rawValue == 1) then
   topmostSubform.FormC2.presence = "visible"
   xfa.host.pageDown();
else
   topmostSubform.FormC2.presence = "hidden"
endif
button 2: Adds a new instance of "Form A"
topmostSubform.FormA.instanceManager.addInstance(1);
xfa.host.pageUp();
Currently, it adds the Form C to the very end, like so:
Form A
Form A
Form A
Form C
Form C
Form C
I am trying to reorder the pages so the user can add in a Form C to every instance of Form A, like so:
Form A
Form C
Form A
Form C
Form A
Form C
It's a little complicated but I would appreciate any help at all!

Answer 1

Ahh, thank you. I just moved Form C into Form A subform group, it works and stays attached to that instance of Form A. Here's another issue... now that I have Form C appended to Form A, when I add in another Form A it correctly gets added after the last Form C but how can I get the form focus to go to the top of that new instance of Form A?
Currently I am using: xfa.host.pageDown()
But now it would be skipping down a few pages. Is there a way to also move to the top of that new instance?
Thanks!