How to add a new service to an existing sample project


Currently, we are developing based on "multirole_lesc", a BLE multi-role project. The project contains the BLE service “hrm”, but I want to add the “RSCS” service to it.
Is there a way to add a new service .c or .h to an existing project?
Thank you.

The environment is as follows.
SoftDevice: S132
BLE Device: NRF52832
SDK version: 15.30
multirole project: experimental⇒ble_app_multirole_lesc