Gung in addition to those types I mentioned above there is:
SHELTER, LIGHTWEIGHT 3.6m x 3.6m (12ft x 12ft) J1/8340-99-120-6736
PASSAGEWAY, SHELTER, STRAIGHT J1/8340-99-130-2183
PASSAGEWAY, SHELTER, STRAIGHT EXTENSION J1/8340-99-130-2301
PASSAGEWAY, SHELTER, 4-WAY CONNECTOR J1/8340-99-130-2184
I can't find any references to specific roles such as catering in the later tentage. The obsolete ones I mentioned like Assembly 'C' was mobile blacksmith/mobile cookhouse, 'D' bakery oven. But these were rather different in construction to the 12x12.
Yes you are correct that within each NSN for a complete shelter the component parts have their own individual NSNs. If there are any of them that you want me to identify I can see what parent shelter they were designed to match up to.