Link goods to sector (UCC to NAICS)
Unfortunately, I'm not aware of any publicly-available concordance, and I can promise you that there's no clean mapping between UCC and NAICS. Obviously, some categories will map well at low granularity (UCC 190903 will definitely map to 722, for example). 

While I'm sure it's fine for whatever you're doing if multiple UCC codes map to a single NAICS code, the big problem is that some UCC codes will map to multiple NAICS codes. For example, 190113, "lunch at vending machines and mobile vendors" will map to some combination of NAICS 454210, "vending machine operators" and NAICS 722330, "mobile food services".

The way this is usually handled is through some form of allocation— you assume, for example, that the CES population you're observing has exactly the same distribution of expenditures as the overall economy.