The phrase "as a subcategory" is correct and usable in written English.
It can be used when discussing classifications or divisions within a broader category.
Example: "In the study of literature, poetry is often analyzed as a subcategory of written art forms."
Alternatives: "as a subset" or "as a division".
Glassman and his colleagues are seeking to have drunkorexia — or a more aptly named "alcoholimia" — added as an official diagnosis in the Diagnostic and Statistical Manual of Mental Disorders (DSM), as a subcategory of Other Specified Feeding and Eating Disorders.
This is defined as the union of a class of sets containing the empty set (the initial object in the category of sets) and closed under the power-set operation and under transfinite unions thus, as a subcategory of the category of sets.
ICT (information and communication technology) certainly qualifies as a subcategory of S&T expenditure.
In this context, metallic glasses are considered as a subcategory of CAMs.
In today's times when environmental problems are one of the major global concerns hovering over the earth, environmental entrepreneurship can be seen as a subcategory of sustainable entrepreneurship which in turn is a subcategory of social entrepreneurship.
Many top bartenders in New York, Chicago, Los Angeles and Las Vegas are totally unfamiliar with this type of tequila, so new that it's still in the process of being officially recognized as a subcategory by the Tequila Regulatory Council CRTTequila Regulatory Council CRT
Sony seems very much to want to position this new device as hardware aimed at a subcategory of its core audience who value high-end graphics (likely those who might otherwise decamp to PCs for better VR visual via Oculus or HTC), and not as something that will ultimately replace the PS4 entirely.
Rather, it treats politics as simply a subcategory of entertainment.
Localization predictions now include a subcategorization (see Section 2 as well as Table 1) for more precise identification of localizations (i.e. a protein may be in the outer membrane but also be a component of the flagellar machinery, so it would be classified as 'outer membrane', with a subcategory classification as 'flagellar').
The trade magazine Billboard classifies norteño as Mexican regional music, a subcategory of Latin music.
Both bodies are also classified as plutoids, members of a subcategory created by the IAU in June 2008 for dwarf planets that are farther from the Sun than Neptune.
