This is not possible to do by default. Here is what I would do in such a case:
There is an Add-On you can purchase for 10 USD:
http://www.simpleaddon.com/Eng/zn_product.html
You can create a Section just behind your Elevation so it cuts your Zones. Then with the Add-On you can create the Zone Name/Number.
Then create a View in which only the Zone info is visible.
Then you can combine the two Views on a Layout. One is a Drawing the source View of which shows the Elevation, the other is a Drawing the source View of which shows only the Zone info.
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