Place the insertion point in the paragraph and choose Restart Numbering from the context menu or choose Type > Bulleted And Numbered Lists > Restart Numbering. In normal lists, this command assigns the number 1 (or letter A) to a paragraph and makes it the first paragraph in a list. In multi-level lists, this command assigns the first lower-level number to a nested paragraph.
Note that the list name remains the same for all of these tags. Table titles have a level 4 designation, and Figure titles have a level 5. The numbering style calls out the level 4 numbers (^4) on the Table titles, and the level 5 numbers (^5) for the Figure titles. It’s important to note that for this style, both of these restart after the level 3s (Subhead 2s).
Select the text frame with the Selection Tool (V, Escape) and go to Edit > Copy and Edit > Paste. Manoeuvre this second text frame onto the left-hand page in a mirrored position. InDesign will provide pop-up guidelines once the text frame lines up exactly with the frame on the right-hand page. Once your happy with the positioning, select the Type Tool (T) and adjust the orientation of the text to Align Left from the Character Formatting Controls panel, as before.
Thanks for the head start on this, it got me part the way through my problem but I found that when I had 3 figures in a row then a map, the next figure would jump back to #.1 again. Because I had figures, maps and tables that needed to be numbered I used the ‘levels’ to differentiate between them as you suggested, but found if you create a new number list for each entry ie. number list for maps, and number list for tables etc then they don’t conflict. thanks for the start off though. no where else pointed it out as clearly as this. Cheers

I tried very hard to understand your request, but I still don't get it. When exactly do you want that your paragraph restarts at "A"? After a certain paragraph style (title, list or whatever)? In that case, you just need to create a multilevel list. Please be more specific, using screenshot of what you want to achieve at the very end. – Vinny May 18 '17 at 8:17 indesign-numbering