Split tunneling on a Cisco Aironet 600 Series OfficeExtend AP allows for traffic to be divided between two different networks. In this case, it enables the user to access the corporate network for work-related tasks while simultaneously allowing them to print to a printer on their home network. This is achieved by routing the traffic meant for the corporate network to the WLC, while local traffic such as the connection to a home printer is kept on the local network.
Reference:
https://www.cisco.com/c/en/us/support/docs/wireless/aironet-602-officeextend-access- point/117540-configure-splittunneloeap-00.html

For FlexConnect APs with locally switched SSIDs, voice QoS based on Layer 2 markings relies on the 802.1p CoS value in the VLAN tag. The switchport connected to the AP must therefore trust CoS so that the AP's Layer 2 markings (CoS) are honored and used for QoS decisions, which corresponds to MLS Trust COS.

Cisco Connected Mobile Experiences (CMX) Location Analytics requires accurate tracking of devices within the wireless network's coverage area. To utilize CMX Location Analytics effectively, it is essential to enable tracking parameters in Cisco Mobility Services Engine (MSE).
This allows MSE to collect data on device locations and movements within the environment, which can then be analyzed by CMX for insights into customer behavior, asset tracking, or other analytical purposes.

FlexConnect groups are responsible for sharing services between APs in the group. For example, the following services are shared within a FlexConnect group:
Cisco Centralized Key Management (CCKM) / Opportunistic Key
Caching (OKC) fast roaming keys
Local/backup RADIUS server keys
Local EAP (Extensible Authentication Protocol) authentication
Smart Image upgrade
FlexConnect AVC (Application Visibility and Control)
AAA-Override for local switching