You probably need to do this in two steps (or one, if only one template).
You need to use the Link database.
The easiest way to see these โlinksโ is to go to Sublayout or Rendering and go to the โNavigationโ menu, and then click โLinksโ. This should show you all the elements that point to this current element and all the elements that current elements point to (i.e., in both directions).
This will probably give you a list of templates and / or elements (if the sub-level is installed directly on the element).
Then go to the template and see how to do the same to see which elements have a link to the template.
This should show you which elements use which sublayers.
Of course, this requires a Link database (this should be done automatically, but you can force it using "Start"> "Control Panel"> "Databases") "Rebuild Link Database" and that Sublayouts, etc. linked in sitecore ..
Hope this helps.
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