Reporting Tags and COGS

Reporting Tags and COGS

Is there any way to get COGS recorded against reporting tags?

The use cases seems very straightforward to me. If I'm running a P/L report against a specific reporting tag (I use mine for customer type, but it could be used for regions, etc.), the revenue shows up just fine, but there are no COGS associated with the sales, which makes it useless for all but the most coarse reporting.

The data are all there to allow for this. It seems like this should be how it works. Am I missing something simple?