Adding bookmarks automatically can be realized with Acrobat Javascript. It is possible to use Acrobat Javascript in LiveCycle Designer. You can use the Acrobat Doc object in a LiveCycle Designer form. You must adapt your code to use the following technique of assigning a variable to the target of, for example, a click event, to access the current document:
var myDoc = event.target;

Afterwards it is quite easy to add the bookmarks. Just suppose you want to add a bookmark with the name of “Management Summary” which refers to a subform with the same name. You must place the javacript code on the layout:ready event of the subform because you need the page number. You first need a reference to the bookmark Root like in the following example:
var root = myDoc.bookmarkRoot;

Now you can add a bookmark to the root through the createChild method. This method has one required and two optional parameters:
1)Name of the bookmark
2)Expression to evaluate: in this case the page number. We must subtract 1 from the page number because acrobat starts counting from 0.
3)The 0-based index into the children array

You can add the bookmark as follows:
root.createChild(”Management Summary”, “this.pageNum=” + (xfa.layout.page(this)-1),0);

If you want to add a child to the bookmark you just created, you can do it like this:
var bm = root.children[0];
bm.createChild(”Overview”, “this.pageNum=” + (xfa.layout.page(this)-1),0);