How to link a text box to an anchor frame in the master pages?

I have included a two pictures that should help me explain.

Master Page:

This is the master page set up, the "Page Text Box" has the flow set to "B" while the S/N text box has the flow set to "A". This setup is for our parts manuals, the left page is usually an illustration while the right page is usually a parts list. The text box, anchored frame & paragraph tag are empty in the master page set up. The "page text box" has a flow of "B" and the "S/N text box" has a master flow of "A".

Body Page 1:

When we create new pages, the paragraph tag automatically fills in the figure title on the left page, then we add an anchor frame within the text box to hold the illustration. You will notice that I added in a "test" serial number at the top of the page. Now if I need to go back and add two pages before this, the anchor frame, illustration and parts list will move to a new page, but the S/N text box will not. The "Before S/N TBD" would stay on the original page.

This is what happens, the text box containing the illustration and the parts list "bump" to the next page, but the S/N text box does not. So the question we have is there a way to link that text box to the page so when we create new pages the S/N text box moves with the illustration.

Does this help?

Thanks for the assistance Error7103.