The Care Unit represent a group of Resident who's ADLs will be provided by a CNA assigned to that group.  The designation of which group a specific Resident is assigned to is specified in the individual worksheet found in the navigation on the left side of the Resident's page.  The location is under Admit Resident. Care unit designations can be made when the resident in first entered or at a later date.  

To review all care group assignments on the CNA Charting navigation tab select Primary Care Unit.  The listing is grouped by the Primary Care Unit number then by room number, Secondary care unit, Resident's name and location. The secondary care unit is for any shift that has reduced ADL to perform such as a night shift were additional rooms can be assigned to the CNAs. 

Secondary care your listing is found as Secondary Care Unit and functions the same as the Primary Care Unit listing.